Regex Tester

How to Use the Regex Tester

Type your regular expression pattern into the pattern field (without delimiters — just the pattern itself). Select the flags you need, then type or paste your test string. Matches are highlighted in real-time.

Flag Reference

• g — Global: find all matches, not just the first.
• i — Case-insensitive: A matches a.
• m — Multiline: ^ and $ match line start/end.
• s — DotAll: . also matches newline characters.

Tips

• Use \d for digits, \w for word chars, \s for whitespace.
• Group with (...), alternate with a|b, repeat with +, *, {n,m}.
• Use ^ and $ to anchor to line/string start and end.