Regex Tester

Test regular expressions in real-time with match highlighting and capture groups.

Regular Expression

/ /

Test String

Matches

Regex tips for fewer surprises

Regular expressions are powerful, but small changes can drastically affect matches. Use this tester to iterate quickly before using a pattern in production code.

Common mistakes

Forgetting to escape special characters like . and ?
Using greedy quantifiers (.*) when you meant non-greedy (.*?)
Not anchoring with ^ and $ when validating full strings

Quick example

Pattern	Example text
`[a-z]+@[a-z]+\\.[a-z]+`	`test@example.com`