Learn RegEx with this slasher-themed text based game. Includes instructions on how to use RegEx and explanations of where it's useful.

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Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.

Learn the ins and outs of regular expressions including character sets and ranges ([]), wildcards (. ), quantifiers ( * , + , ? ), metacharacters ( \d , \w , \s ), anchors ( ^ , $ ), and capture groups ( () ).

Learn Regular Expressions with simple, interactive exercises. Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even documents.

Regular Expression Matching - Given an input string s and a pattern p, implement regular expression matching with support for '.' and '*' where: * '.' Matches any single character. * '*' Matches zero or more of the preceding element. The …

Write a Regex that can match a positive or negative number. Become a Regex Master by solving challenges from Easy to Nightmare.

Eliminate the falling tiles in real-time with your sweet RegEx skills. For level 0, there is only one color of tile so you can match every character. The regex wildcard (.) matches one of anything. Your regex is applied with the "g" (global) flag, so it matches as many times as possible. A single period will match the entire bottom row.

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details. Validate patterns with suites of Tests. Save & share expressions with others. Use Tools to explore your results.

Are you a fan of regex and want to test your skills? Play the game and highlight the selected characters.