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Regex Tester

Test and debug regular expressions with real-time matching, capture groups, and replace preview.

Test String

Matches (3 found)

#	Match	Index	Groups
1	support@example.com	14	-
2	sales@company.co.uk	37	-
3	hello@test.org	70	-

. Any char

\d Digit

\w Word

\s Space

* 0+ times

+ 1+ times

? Optional

^$ Start/End

How to use Regex Tester

1
Enter Pattern
Type your regular expression pattern in the pattern field.
2
Set Flags
Toggle flags: g (global), i (ignore case), m (multiline), s (dotall), u (unicode).
3
Test String
Paste or type the text you want to test against the pattern.
4
Review Matches
See highlighted matches, capture groups, and match details in real-time.

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Flags modify regex behavior: g (find all matches), i (ignore case), m (^ and $ match lines), s (dot matches newlines), u (unicode support).

Use parentheses () to create capture groups. Access them in replacements with $1, $2, etc. The full match is $&.

Check for proper escaping (use \ for special chars), ensure flags are correct, and verify your pattern syntax.

* matches zero or more occurrences, + matches one or more. Use * when something is optional, + when required.

Escape them with backslash: \. matches a literal dot, \+ matches a plus sign, etc.