Regex Tester

Test and debug regular expressions with live match highlighting.

Examples:

Regular Expression

Click to toggle flags

Test String

0 / 50,000 chars

About Regex Tester

Regular expressions (regex) are patterns used to match character combinations in strings. Use this tool to test, debug, and understand regex patterns. Supports all standard JavaScript regex syntax including lookaheads, named groups, and character classes. The g flag is always active for matchAll; toggle others as needed.