Regex To Allow Special Characters In Javascript

JavaScript is a general purpose programming language that is used to improve web pages. To achieve the same result in python, use this regex and pass the re. Often a regular expression can in itself provide string handling that other functionalities such as the built-in string methods and properties can only do if you use them in a complicated function or loop. Sublime Text Regular Expression Cheat Sheet. Then, in Excel 2007, go to the Data tab and choose Data Validation from the Data Tools group. In remarks fields we don't want that user can enter anything, user can only able to enter alphanumeric with white space and some spacial character like -,. Regular Expression Reference: Special and Non-Printable Characters JGsoft. Here is a Javascript regular expression to convert a backslash to a forward slash. RegExp Syntax. Let's assume you want to display a Unicode character via JavaScript that is in an astral plane (obviously, there is a risk when doing so: not all fonts support all such characters). If you want to allow numbers/digits or any other special characters, it's just a matter of updating the regular expression pattern. I'll be using JavaScript in my examples. Allow duplicate names Characters Set Regular Expression Options Shorthand. RLIKE is the synonym; Regular expressions support a number of metacharacters which allow for more flexibility and control when performing pattern matches. Validates dates that are in month/year (MMYYYY) format without slashes, periods, dashes, or spaces. loses its special meaning inside a character class, while the expression -becomes a range forming metacharacter. Again, a less confusing solution would have been to just allow an extra argument to be passed to exec, but confusion is an essential feature of JavaScript's regular expression interface. Each search (global or column) can be marked as a regular expression (allowing you to create very complex interactions) and as a smart search or not. You can still take a look, but it. net C# Regex to Replace All Special Characters with Space in String - ASP. With an added quantifier that repeats the character class one or more times, and anchors that bind the match to the start and end of the string, we're good to go. text box control to to allow only letters. Earlier we have learned about character classes, but we have not covered everything there. The characters that are given special meaning within a regular expression, are:. Try it here! Just type in the text box below. It is used to specify how may times you expect to see the previous character set. Write a Regular Expression to remove all special characters from a JavaScript String? Javascript Web Development Front End Technology To remove all special characters from a JavaScript string, you can try to run the following code:. To make special characters and accented letters show up on your pages, use a special set of codes called character entities, which you insert into your HTML code and which your. 03/30/2017; 33 minutes to read +11; In this article. My HR request BF = 'brought forward', leave cannot apply date greater than 31/03 of particular year. That’s also called “escaping a character”. Available Functions. Javascript (ECMAScript) is a loosely typed language. Depending on how you compose your regular expression, it may be easier to use one or the other. VBScript String Clean Functions -3 Methods to Remove or Replace Characters in a String Original Post: 21st April 2009 Updated: 16th March 2010 The following VBScript / VBA function removes special (illegal in file names) characters from a string and returns a clean string. The request was for exactly eight characters -- which is not handled by the regex. We use a pattern to change multiple spaces to single spaces. split() is based on regex expression, a special attention is needed with some characters which have a special meaning in a regex expression. So it's a special character in regexps (just like in regular strings). In library, three kinds of regular expression operations are defined: 1. It is almost always preferable to use an encoding that allows you to represent characters in their normal form, rather than using named character references or numeric character references. Rather, the application will invoke it for you when needed, making sure the right regular expression is. However, it is not currently possible to configure this via the GUI, so it cannot really be used. This article will illustrate how to use Regular Expression which allows Alphabets and Numbers (AlphaNumeric) characters with Space to exclude (not allow) all Special Characters. In SQL databases, selecting values based on regular expressions defined in the WHERE condition can be very useful. If you can say what you mean by "special" characters (or, if it's easier, what "unspecial" characters are), then someone can show you how to detect or remove them. A regular expression (regex or regexp for short) is a special text string for describing a search pattern. Additionally, there is a special metacharacter \b which matches the boundary between a word and a non-word character. I am struggling to come up with JS that doesn't allow special characters and no spacing on one particular field. Strictly speaking, "\b" matches in these three positions: Before the first character in the data, if the first character is a word character. But you can do much more with regular expressions. 4) method that will return a String array. How to validate if text box have only special character? Online visual regex tester. In this post we will learn how to check string contains special characters using regex (regular expression) in java. RegEx supports the use of unicode characters and those from other languages. In a regular expression a dot means “any character except a newline”, so if we really mean “a dot”, let’s put a backslash before it: \. source code is also available on github check here. To achieve the same result in python, use this regex and pass the re. $ ---->End of a string. That means ^ and $ anchors. A set of rules describing a condition in the compact form of a regular expression. ) by preceding it with a \ (backslash): grep 'purchase. JavaScript 1. There are even character that gain special meaning inside a character class. This allows to isolates a text in a page and eventually replace it. Instead of the mask element, you can define your own regular expression to validate the input of a particular input place. That is, the regular expression "0*" matches zero or more zeros, while the expression "[0-9]*" matches zero or more numbers. Further, immaterial of ddlMethod value, another validation is only alphanumeric characters are allowed at positions 1, 4, 10. I'll cover the following topics in the code samples below: Restrict, Control, Button, KeyPress, Enter, Regular Expression, Special Characters, and Textbox. Oracle and Regular Expressions. Since we are capturing the keyup event, we are also preventing copying and pasting of non-alphanumeric characters. I'm not 100% happy with the method as that whole "remove invalid characters" block is repetetive and I know it's creating a new string object with each call. Whenever you are referring to a regular expression that has not been freshly created, you should set its lastIndex property to zero, before using it as an iterator (an explanation is offered in the next example). Please post an example. Bob1 returns valid but should NOT be valid. Many of the examples can be run (where it makes sense) by pressing the button on the right. Regular Expression Reference: Special and Non-Printable Characters JGsoft. No special chars (@! etc. Available Functions. Regular Expression to allow only Numbers and Special characters in JavaScript. But what if we wanted to include a quote (") character WITHIN the string. Namespace: All these types are found in the System. ) Be aware that dash ( - ) has a special meaning in charclass expressions. The numeric character reference must be UTF-8 because the supported encoding for XML files is defined in the prolog as encoding="UTF-8" and should not be changed. Regex for Quoted String with escapable quotes By Chris Trahey , Director of Strategy, September 11, 2013 This post is a long-format reply to Jonathan Jordan's recent post. You can use text strings as literal values or assign them to a variable. Pattern-matching characters can be grouped into various categories, which will be explained in detail later. Selenium commands, often called selenese, are the set of commands that run your tests. regex package which has been part of standard Java (JSE) since Java 1. When calling a RegExp constructor, you have to double each of the two backslashes in the string argument passed to the constructor, like this: "\\\\". A humble request Our website is made possible by displaying online advertisements to our visitors. Those circumstances are that the regular expression must have the global (g) or sticky (y) option enabled, and the match must happen through the exec method. Characters in RegEx are understood to be either a metacharacter with a special meaning or a regular character with a literal meaning. In this post we will learn how to check string contains special characters using regex (regular expression) in java. I need to test or check a string for alphanumeric values i. thx in advance. Often a regular expression can in itself provide string handling that other functionalities such as the built-in string methods and properties can only do if you use them in a complicated function or loop. It is one of the most commonly used special characters in regex, because of its specific ability to match (almost) anything. ^+] looks for one of the characters -(). and contain no special character except for period at end next to file extension in a shell script. by Dale Fugier (Last modified: 05 Dec 2018) This guide discusses the VBScript RegExp object. Earlier we have learned about character classes, but we have not covered everything there. Java regex is the official Java regular expression API. Can you please help me to list down the special characters not allowed in SharePoint 2013\2016 files\folders? Thanks. parameterize a regex special characters split. Just compare the characters' and digits' ASCII values with the character entered on OnKeyUp event. * + ? ( ) [ ] { } | [class] character class: the target character is part of the class (see character classes below) [^class]. A software engineer provides a tutorial article on how to use the JavaScript language to write RegEx patterns Use RegEx to Test Password Strength in JavaScript one special character, but. Regular expressions are patterns used to match character combinations in strings. $ ---->End of a string. How to validate if text box have only special character? Online visual regex tester. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Simple RegEx Tutorial. , plus a set of special regular expression characters (do not confuse with the HTML special characters). I would normally use Perl and regex for this, but to simplify portability between Windows computers, I am hoping to accomplish the following using PowerShell instead: A CSV file containing incorrectly encoded characters needs to be parsed and corrected. My HR request BF = 'brought forward', leave cannot apply date greater than 31/03 of particular year. This matches every single character in the searched string, except for a new line. We can further see this by adding a value to our table with a leading, ending and. Validates dates that are in month/year (MMYYYY) format without slashes, periods, dashes, or spaces. The following are some common RegEx metacharacters and examples of what they would match or not match in RegEx. Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns. If the character does not match, then alert will be display that notifies about wrong input to user. Any character can be escaped except those which form any of the special character sequences above. Regular expressions provides one of the simplest ways to find whether string contains special characters or not in java. Net framework uses a traditional NFA regex engine, to learn more about regular expressions look for the book Mastering Regular Expressions by Jeffrey Friedl “Mere enthusiasm is the all in all. Regex to allow anything but whitespace? PHP. My requirement is not to allow {}* these special characters in user input. This search box should not allow any special characters to be typed by the user. As an MPE user, you may find regular expressions difficult to use at first. The most used special characters are: Square brackets []. Feel free to contribute!. In Example 1, no characters follow the last period, so the regex matches any IP address beginning with 192. Regular Expressions (Regex) Character Classes Cheat Sheet Any character defined as a printable character except those defined as part of the space character class. This regular expression will be in used in Java. Allow all this page and Temporarily allow all this page enable every site shown as allowable by NoScript's menu on the current page, unless already marked as untrusted. how to use JavaScript regular expression to remove special characters or regular expression to escape special characters in JavaScript or regex to replace special characters in string using. A regular expression is a set of characters forming a pattern that can be searched in a string. -match uses regular expression. It is working fine in javascript regex. Escape sequences are methods that the language uses to remove the special meaning from the symbol, enabling it to be used as a normal character, or sequence of. When calling a RegExp constructor, you have to double each of the two backslashes in the string argument passed to the constructor, like this: "\\\\". It is often called a pattern as it describes a set of strings. / in Alice will match the first letter, A. A regular expression is a text pattern consisting of a combination of alphanumeric characters and special characters known as metacharacters. A regular expression is an object that describes a pattern of characters. As with LIKE, pattern characters match string characters exactly unless they are special characters in the regular expression language — but regular expressions use different special characters than LIKE does. I tried it on client side, but it is not working for me on server side. By default, mod_rewrite maps a URL to a filesystem path. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. The power of the regular expressions comes when we add to special characters to the search string that allow us to more precisely control which lines match the string. Because we provided g flag at the end of the regular expression now it will find all matches in the input string, not just the first one (which is the default behavior). Introduction to Bash, VIM & Regex. When calling a RegExp constructor, you have to double each of the two backslashes in the string argument passed to the constructor, like this: "\\\\". This article will cover the validations using the regex as well as using simple methods. An alternative is to override the wording and styling using the setCustomValidity() method in JavaScript. RegExp Object. I'm working with web services that don't like punctuation, but I don't want to code string values with a generic recordID because I still want the results to be readable. In all of the following examples, the source CoffeeScript is provided on the left, and the direct compilation into JavaScript is on the right. How can I modify the regex to. This is a surprisingly tricky thing to do nicely. The above code works fine for characters other than the ones that have a meaning in regular expressions such as ?, *, \,. (at)/g means: any character except new line, followed by lowercase character a, followed by lowercase character t. 1 I require a reqular expression which can accept any character other than single quote('), double quote( ), @, %,# Can anyone help me in this Thanks Regular Expression to exclude some special characters. The special character "\w" represents any English letter or digit. That means ^ and $ anchors. Matches array: Some operations allow to retrieve information about matches. Its about validate. VBScript RegExp Objects. parameterize a regex special characters split. The principle applies when dealing with special characters in general. my test cases. A Look at Characters, Types, Operators, and More. dontselect=?? This validation descriptor is valid only for drop down lists. In JavaScript, regular expressions are also objects. Special characters validation using JavaScript or jQuery - Learn how to check special character in JavaScript. This must be an object of a basic_regex type (such as regex), generally constructed from a string with a special syntax that describes what constitutes a match (see ECMAScript syntax). This only applies to data characters; white space characters may never appear within special character sequences in a pattern. It is based on a subset of the JavaScript Programming Language Standard ECMA-262 3rd Edition - December 1999. The regular expression language in. Validate Validate hi all. A regular expression is an object that describes a pattern of characters. The next column, "Legend", explains what the element means (or encodes) in the regex syntax. Now it's part of many programming languages like Perl, Java, Python, Ruby, and JavaScript. The characters that are given special meaning within a regular expression, are:. javascript regex for special characters. Fundamentally, -d will only test a single argument - even if you could match filenames using a regular expression. Please help. Is it just me or does it appear like a few of these remarks come across as if they are written by brain dead folks? 😛 And, if you. NET Java Perl PCRE PCRE2 PHP Delphi R JavaScript VBScript XRegExp Python Ruby std::regex Boost Tcl ARE. For example, the regular expression/. The following issues are involved in such extensions. I want to do this using Regular Expressions and JavaScript. Can you please help me to list down the special characters not allowed in SharePoint 2013\2016 files\folders? Thanks. We’ll also put regular expressions in use to make sure users really enter a valid phone number. The function can be used as follows: trim(' - hello** +', '+*- '); The escaping is required as + *. It can merge multiple spaces in a string to one space. By using a slash, "\", you tell the regex you want to match exactly the period character. NET,JQuery,JavaScript,Gridview. Bob1 returns valid but should NOT be valid. We use its constructor and the Match method, and then handle the returned Match object. We’ll use HTML5, CSS3 and JavaScript to get to the GUI you can see and test in the demo below. Special RegExp Characters According to the Java regular expressions API documentation, there is a set of special characters also known as metacharacters present in a regular expression. Following are a few use cases of how you can use regular expressions. I'm working on a DB2 database and as far as I can see regexp is not supported (without additional libraries). REGEXP is the operator used when performing regular expression pattern matches. net , C# , Regular Expression How to validate that input string contains only alphabets, validating that textbox contains only alphabets (letter), so here is some of the ways for doing such task. The field will accept that character which the regular expression allow it to do. Often a regular expression can in itself provide string handling that other functionalities such as the built-in string methods and properties can only do if you use them in a complicated function or loop. Python has a slightly different syntax. net c# page. com is a site collecting all the cheatsheets,all!. In order to use one of these characters, we need to put \\ in front of the character:. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Many times it is necessary for a C# Textbox control to only receive only numbers as input. A regular expression is an object that describes a pattern of characters. Re: Validation - Alphanumeric characters Shashidhar Gomaram Feb 12, 2014 9:50 PM ( in response to Junjun Yin ) In Data Quality, You can use existing character sets to validate the string. This must be an object of a basic_regex type (such as regex), generally constructed from a string with a special syntax that describes what constitutes a match (see ECMAScript syntax). ]#/ was really tiring. Regex also known as regular expressions is a sequence of characters that is used to search for one or more matches in search pattern. Regular Expression can be used in Content Filter conditions. You can use any characters in the alphabet in a regular expression. Make your first Regular Expression There are two ways to construct a regular expression, by using a regular expression literal, or by using the regular expression constructor. A sequence of these commands is a test script. Bob returns valid which is what I need. Regular expression patterns pack a lot of meaning into just a few characters , but they are so dense, you can spend a lot of time debugging your patterns. characters contained in a set of parentheses within a regular expression, which allow you to specify the format and quantities of the enclosed characters as a group. This is a surprisingly tricky thing to do nicely. Matcher classes at server side. ) only? I want to tell my grep command that I want actual dot (. The regular expression syntax is based on the standard used by Java. ^[a-zA-Z0-9_]*$ For example, when using this regular expression “HelloWorld” is fine but “Hello World” does not match. The following describes general guidelines for extending regular expression engines (Regex) to handle Unicode. If you want regex to treat forward slash as a forward slash and not some special character then you store a regular expression in JavaScript. To enable cookies in your Google Chrome web browser, start by opening the drop-down menu and selecting “Settings. If any special character found, don’t accept that string. If you can say what you mean by "special" characters (or, if it's easier, what "unspecial" characters are), then someone can show you how to detect or remove them. Cross-Site scripting protection is enhanced to use regular expressions which are not case-sensitive. It is working fine in javascript regex. A character class defines a set of characters, any one of which can occur in an input string for a match to succeed. Example: “regexp=^[A-Za-z]{1,20}$” allow up to 20 alphabetic characters. This solution works in both IE and Netscape/Mozilla. The Java regex API is located in the java. Any character can be escaped except those which form any of the special character sequences above. The program also prevents user from copying and pasting invalid characters into the TextBox. It matches at the start or the end of a word. Form Validation Using jQuery and Regular Expressions Regular expressions offer an extremely flexible and powerful way of adding validation to your website forms. This Java regex tutorial will explain how to use this API. The dollar sign anchor tells regex that this is the end of the string we want to match. Two types of regular expressions are used in R, extended regular expressions (the default) and Perl-like regular expressions used by perl = TRUE. It is easy for machines to parse and generate. Javascript Form validation is used for validate the user's input data for any registration form, contact form etc. One line of regex can easily replace several dozen lines of programming codes. The characters that are given special meaning within a regular expression, are:. JavaScript code to allow only numbers in textbox, restrict alphabets and special characters in textbox using JavaScript function. RLIKE is the synonym; Regular expressions support a number of metacharacters which allow for more flexibility and control when performing pattern matches. which allow for. The VBScript RegExp object matches strings against special text patterns, called regular expressions. net , C# , Regular Expression How to validate that input string contains only alphabets, validating that textbox contains only alphabets (letter), so here is some of the ways for doing such task. Also, - in a character set can mean a range (like "A-Z") so you should either escape it or put it as the very first or very last character (where it couldn't possibly mean a range). Cells objCell. For normal text (not markup), there are no special characters except < and &: just make sure your XML Declaration refers to the correct encoding scheme for the language and/or writing system you want to use, and that your computer correctly stores the file using that encoding scheme. Regular Expression, or regex or regexp in short, is extremely and amazingly powerful in searching and manipulating text strings, particularly in processing text files. YYYY values allowed are 1900 - 2999. Regular Expression to Validate the text that contains special characters. On the OnClick event of the Button, a JavaScript function is executed which validates the TextBox text against the Regular Expression (Regex) and if it contains character other than Numbers (Digits) or the specified Special characters then an error message is displayed. In all of the following examples, the source CoffeeScript is provided on the left, and the direct compilation into JavaScript is on the right. This rule disallows control characters in regular expressions. A regular expression is a rule which defines how characters can appear in an expression. You want to remove parenthesis, i. Learning Regular Expressions for Beginners: The Basics Written by Mark Sanborn: Oct 21, 2008. Note: For many years now, UltraEdit and UEStudio have included full support for Perl-compatible regular expressions. To require the match to occur only at the beginning or end, use an anchor. After learning Java regex tutorial, you will be able to test your regular expressions by the Java Regex Tester Tool. Article SummaryX. Extended regular expressions include all of the basic meta-characters, along with additional meta-characters to create more. The \ before each period "escapes" the period—that is, it indicates that the period isn't a regex special character itself. The following regular expression matches a string consisting of at least one character that is not a space (and no spaces): In this example the first caret matches the beginning of the string, whereas the second one indicates that the character class matches any character but those inside it (a space in this case). Covers basic features of regular expressions, including normal and special characters, quantifiers, capturing and non-capturing groups. Please persevere, because they are used in many UNIX tools, from more to perl. How to add and remove input values in Javascript How to add list of array through input element, make sure not allowing entered values and to display them in below? How to get input values while click with enter key in text field and button click. Write a Regular Expression to remove all special characters from a JavaScript String? Javascript Web Development Front End Technology To remove all special characters from a JavaScript string, you can try to run the following code:. Going too deeply into validation per countries is not recommended. The third part of a regular expression is the modifier. Creating a Regular Expression. Regex – Regular Expression A RegEx (Regular Expression) is a pattern matching method often used in text searches and data processing. Also, the extra spaces inside the multiline string for the regular expression are not considered part of the text pattern to be matched. com is a site collecting all the cheatsheets,all!. Character classes allow you to specify a set or range of characters to be matched. How to add and remove input values in Javascript How to add list of array through input element, make sure not allowing entered values and to display them in below? How to get input values while click with enter key in text field and button click. Value = RegEx. It pre-defines characters in the particular form field. If you want the entire string then you have to make sure it matches every character from the beginning of the string to the end. Since we are capturing the keyup event, we are also preventing copying and pasting of non-alphanumeric characters. I'll be using JavaScript in my examples. how to validate textbox to accept only characters hi I am using RAD Text box. *", text) The first parameter of the match function is the regex expression that you want to search. Please help. This program introduces the Regex class. 0 Likes out how to define 'special characters' in the regex for the. Alternatively, if you set the collate flag when constructing the regular expression, then ranges are locale sensitive. JavaScript, Python, and PCRE. We use its constructor and the Match method, and then handle the returned Match object. In this post, we'll use Regex to remove everything between, and including, two predetermined characters. The characters that are given special meaning within a regular expression, are:. However, you often like to raise an exception when the business rule of your application gets violated. You've been Haacked is a blog about Technology, Software, Management, and Open Source. I'm working with web services that don't like punctuation, but I don't want to code string values with a generic recordID because I still want the results to be readable. Value = RegEx. Regular expression metacharacters. Regex to allow anything but whitespace? PHP. This regex works great but it doesn’t allow for spaces between words. Additionally, there is a special metacharacter \b which matches the boundary between a word and a non-word character. RegExp") RegEx. 2 compliance for either BRE or ERE. It is used to specify how may times you expect to see the previous character set. expression you have to enable case. The mod_rewrite module uses a rule-based rewriting engine, based on a PCRE regular-expression parser, to rewrite requested URLs on the fly. The regular expression token "\b" is called a word boundary. The combination "\w" stands for a "word" character, one of the convenience escape sequences while "\1" is one of the substitution special characters. Using a Regular Expression to Match HTML | You’ve Been Haacked. ^[a-zA-Z0-9_]*$ For example, when using this regular expression “HelloWorld” is fine but “Hello World” does not match. ^+] looks for one of the characters -(). split() is based on regex expression, a special attention is needed with some characters which have a special meaning in a regex expression. The JavaScript RegExp class represents regular expressions, and both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text. You can make it match the new line as well, if you pass in the specific flag. NET,JQuery,JavaScript,Gridview. The description of the "u" flag is a bit misleading. Sublime Text Regular Expression Cheat Sheet. ¶ The search method resembles indexOf, but it searches for a regular expression instead of a string. Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns. A cheat sheet about regex in Sublime Text. text box control to to allow only letters. In the following example, regular expression has been set for each input places. To escape the special meaning of the next character, use the \ (backslash) symbol. For example: SELECT * FROM products WHERE product_name REGEXP '\\(';. In this article we are going to discuss about using Regular expressions in VB Script/UFT (formerly QTP). The length should be greater than 8 characters. By default, for Perl regular expressions, a character x is within the range y to z, if the code point of the character lies within the codepoints of the endpoints of the range. parameterize a regex special characters split. Sublime Text Regular Expression Cheat Sheet. A character class defines a set of characters, any one of which can occur in an input string for a match to succeed. NET,JQuery,JavaScript,Gridview. , regardless of the number that follows. A special sequence, that will make the code shorter and more readable. In a regex, a period character by itself is used to symbolize a wildcard; as in, it can represent any character. Control characters are special, invisible characters in the ASCII range 0-31. If any special character found, don’t accept that string. Almost perfect email address regular expression. The VBScript RegExp object matches strings against special text patterns, called regular expressions. Again, a less confusing solution would have been to just allow an extra argument to be passed to exec, but confusion is an essential feature of JavaScript's regular expression interface. However, it can also be used to redirect one URL to another URL, or to invoke an internal proxy fetch. Toggle navigation The Polyglot Developer About. For example: SELECT * FROM products WHERE product_name REGEXP '\\(';. Regular Expression Unicode This is an online tool that builds a JavaScript regular expression that matches characters that fall in any number of specified Unicode blocks. To make special characters and accented letters show up on your pages, use a special set of codes called character entities, which you insert into your HTML code and which your. The syntax for a RegExp object is /pattern/, so we need /(/ and /)/ to represent that we want a pattern which matches a.

Regex To Allow Special Characters In Javascript