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Regex Tester

Test regular expressions and highlight every match clearly.

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How to Use Regex Tester

  1. Enter a pattern without surrounding slashes.
  2. Set flags such as g, i, m, s, and u.
  3. Type sample text.
  4. Review highlighted matches and capture groups.

Why Use This Tool?

Immediate match feedback helps you refine validation rules, search patterns, replacements, and log parsers before adding them to code.

Frequently Asked Questions

Do I include forward slashes?
No. Enter the expression itself and choose flags separately.
What do capture groups show?
Group 1 is the first parenthesized group, group 2 the second, and so on.
Why does the page freeze?
Some patterns can take exponential time. Test risky expressions against small strings and avoid ambiguous nested quantifiers.

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