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Regular Expression Tester

Test, validate, and debug regular expressions with real-time matching

Regular Expression Pattern

Regex Flags

g - Global - Find all matchesi - Case Insensitive - Ignore casem - Multiline - ^ and $ match line breakss - Dot All - . matches newlinesu - Unicode - Enable unicode featuresy - Sticky - Match from lastIndex

Test String

Matches (0)

No matches found

Highlighted Matches

Hello World 123

Common Patterns

Quick Regex Reference

Character Classes

. - Any character
\d - Digit (0-9)
\w - Word character
\s - Whitespace
[abc] - Any of a, b, c
[^abc] - Not a, b, or c

Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - Exactly n
{n,} - n or more
{n,m} - Between n and m

Anchors & Groups

^ - Start of line
$ - End of line
\b - Word boundary
(abc) - Capture group
(?:abc) - Non-capture group
a|b - a or b