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

Menu 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 …

The phrase regular expressions, or regexes, is often used to mean the specific, standard textual syntax for representing patterns for matching text, as distinct from the mathematical notation described below.

6 days ago · Character class: Matches any one of the enclosed characters. You can specify a range of characters by using a hyphen, but if the hyphen appears as the first or last character enclosed in the …

Apr 12, 2024 · Start by understanding the special characters used in regex, such as ".", "*", "+", "?", and more. Choose a programming language or tool that supports regex, such as Python, Perl, or grep.

If you are a complete beginner, you should get a firm grasp of basic regex syntax just by reading the examples in the tables. I tried to introduce features in a logical order and to keep out oddities that I've …

Oct 29, 2025 · This quick reference is a summary of all the regex syntax that is listed in the full reference tables, without any explanation. You can use this table if you’ve seen some syntax in somebody …

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.

3 days ago · Regular expressions (called REs, or regexes, or regex patterns) are essentially a tiny, highly specialized programming language embedded inside Python and made available through the …

Learn Regex interactively, practice at your level, test and share your own Regex.