RegEx Tester

Test and debug regular expressions online. Find matches, validate patterns, and perform text replacements.

Enter a pattern and test string to see matches

Replacement Text:

Use $1, $2, etc. to reference capture groups

Result:

\d+ - One or more digits

\w+ - One or more word characters

\s+ - One or more whitespace

^ - Start of string/line

$ - End of string/line

g - Find all matches

i - Ignore case

m - Treat as multiple lines

s - . matches newlines

u - Unicode support

y - Match from lastIndex