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Regex Tester & Debugger

Test and debug regular expressions online. See matches highlighted in real-time with capture group details and match information.

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Frequently Asked Questions

What are regular expressions?
Regular expressions (regex) are sequences of characters that define a search pattern. They are used for string matching, validation, and text manipulation.
What regex flags are supported?
Common flags include: g (global), i (case-insensitive), m (multiline), s (dotall), and u (unicode).
How do I capture groups?
Use parentheses () to create capture groups. Named groups use (?<name>pattern) syntax. The tool displays all captured groups for each match.

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How to Use

  1. 1 Enter your regular expression pattern in the regex field.
  2. 2 Type or paste the test string you want to match against.
  3. 3 Toggle flags (g, i, m, s) as needed for global, case-insensitive, multiline, or dotall matching.
  4. 4 View highlighted matches, capture groups, and match positions in real time.