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RegExr: Learn, Build, & Test RegEx

RegExr is a web-based application that helps you create and test regular expressions (RegEx) for JavaScript and PHP/PCRE. You can edit the expression and text, run tests, use tools, access a cheatsheet, a reference, and a community patterns library.

regex101: build, test, and debug regex

regex101 is a web-based application that allows you to build, test, and debug regular expressions (regex) for various languages and platforms. You can enter your regex and test string, see the match information and explanation, and use the quick reference for common tokens and syntax.

RegExp - JavaScript | MDN - MDN Web Docs

There are two ways to create a RegExp object: a literal notation and a constructor.. The literal notation takes a pattern between two slashes, followed by optional flags, after the second slash.; The constructor function takes either a string or a RegExp object as its first parameter and a string of optional flags as its second parameter.; The following three expressions create the same ...

Regular expression - Wikipedia

Learn about the history, syntax and usage of regular expressions, a sequence of characters that specifies a match pattern in text. Find out how regexes are used in search engines, programming languages, text editors and more.

JavaScript RegExp Reference - W3Schools

Learn how to use regular expressions (regexp) with the RegExp object in JavaScript. Find out the syntax, modifiers, brackets, metacharacters, quantifiers, properties and methods of regexp.

Regular expression syntax cheat sheet - JavaScript | MDN - MDN Web Docs

This page provides an overall cheat sheet of all the capabilities of RegExp syntax by aggregating the content of the articles in the RegExp guide. If you need more information on a specific topic, please follow the link on the corresponding heading to access the full article or head to the guide.

RegExp() constructor - JavaScript | MDN - MDN Web Docs

The RegExp() constructor creates RegExp objects. pattern. The text of the regular expression. This can also be another RegExp object.. flags Optional. If specified, flags is a string that contains the flags to add. Alternatively, if a RegExp object is supplied for the pattern, the flags string will replace any of that object's flags (and lastIndex will be reset to 0).

JavaScript RegExp Object - W3Schools

Learn how to use regular expressions (regexp) in JavaScript to perform text search and replace operations. Find out how to use string methods, RegExp object, modifiers, patterns, metacharacters, quantifiers and more.

JavaScript Regular Expressions (RegExp) Examples

The RegExp() constructor in JavaScript allows you to create a regular expression object that can be used to match patterns in strings. This method is particularly useful when you need to dynamically create regular expressions from strings or variables. [GFGTABS] JavaScript let pat = "hello. 2 min read. Article Tags :

JavaScript RegExp (Regular Expression) - GeeksforGeeks

Here, we dynamically create a RegExp object using the RegExp() constructor. The pattern "hello" will match the string "Hello" because of the 'i' flag, which makes the search case-insensitive. regex.test(s) returns true because "Hello" matches the pattern "hello" in a case-insensitive manner. 2. Using Regular Expression Literal

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