Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java. Features a regex quiz & library.

Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.

A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that define a search pattern.

Регулярные выражения. JavaScript. RegExp.

https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Global_Objects/RegExp - регулярные выражения JavaScript.

In this quick reference, learn to use regular expression patterns to match input text. A pattern has one or more character literals, operators, or constructs.

This quick start gets you up to speed quickly with regular expressions. Obviously, this brief introduction cannot explain everything there is to know about regular expressions. For detailed...

Regular expressions are used to perform pattern-matching and "search-and-replace" functions on text. For a tutorial about Regular Expressions, read our JavaScript RegExp Tutorial.

Основы / Regular Expressions / RegEx / RegExp.

If the regexp doesn't have flag g, then it returns the first match as an array with capturing groups and properties index (position of the match), input (input string, equals str)

Regular Expression Tester with highlighting for Javascript and PCRE. Quickly test and debug your regex. Results update in real-time as you type. Roll over a match or expression for details.