Build and test regular expressions with live matching, group highlighting, and an explanation of each pattern component.
Enter a pattern and test string to see matches
Matches will be highlighted here
Enter a pattern to see its explanation
A regular expression (regex) is a sequence of characters that defines a search pattern. It's used for pattern matching within strings, commonly for validation, searching, and text manipulation.
Regular expressions are supported in virtually all programming languages and are essential for tasks like form validation, log parsing, data extraction, and search-and-replace operations.
. - Any character\d - Digit (0-9)\w - Word character\s - Whitespace* - 0 or more+ - 1 or more? - 0 or 1[abc] - Character setRegular expressions (regex) are patterns used to match character combinations in strings. They are supported in virtually every programming language and are essential for text validation, search and replace, data extraction, and input parsing.
This tool provides a live testing environment where you can write a regex pattern, apply it to test strings, and immediately see which parts match. It highlights capture groups, explains pattern components, and flags common mistakes like catastrophic backtracking or unescaped special characters.
A regular expression is a pattern that describes a set of strings. Developers use regex for searching, matching, and replacing text in code, logs, and data processing pipelines.
Yes. Paste your pattern and test string into the tool. It highlights all matches in real time, shows capture groups, and explains what each part of the pattern does.
The tool uses JavaScript's regex engine, which supports most common patterns including lookahead, lookbehind, named groups, and Unicode properties.
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