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Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
A regular expression (shortened as regex or regexp), [1] sometimes referred to as a rational expression, [2][3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. Regular expression techniques are developed in theoretical computer ...
Learn how to create and use RegExp objects in JavaScript to match text with a pattern. Find out the syntax, flags, methods, and properties of regular expressions, and how to handle special cases and edge cases.
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.
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.
Learn how to use regular expressions (regex or regexp) to search and replace text in various applications and languages. Find comprehensive tutorials, examples, reference, book reviews and more on this website.
Regular expression syntax cheat sheet 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.
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 This is the most common and simple way to create a regular ...
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.