Regex Tester
Test and debug regular expressions
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What is this tool?
Tests a regular expression against sample text in real time, highlighting matches directly within the text as you build and refine the pattern -- rather than leaving you to figure out where a match landed from a raw list of index numbers.
How to use it
Enter your regular expression and some test text. Matches are highlighted directly in the text below as you type, with a plain-language explanation if the pattern is invalid, and each match's captured groups (the parts inside parentheses) shown separately when your pattern uses them.
Build complex patterns incrementally — start with a simple pattern that matches the basic case, confirm it works, then add complexity piece by piece rather than trying to write the whole expression at once. If a pattern isn't matching what you expect, check the highlighted text first -- seeing exactly what it caught (and didn't) is usually faster than staring at the pattern alone.
Watch: Regex Tester in Action
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Frequently asked questions
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