Regex Tester

Test regular expressions with live highlighting

Write a pattern, set flags, and see every match highlighted in the sample text. Capture groups are listed under each match for quick debugging.

JavaScript regex tips

• Use \\d for digits; remember to escape backslashes in strings.
• Flag i ignores case; m makes ^/$ line-aware; s lets . match newlines.
• Prefer non-greedy quantifiers (*?, +?) when over-matching.