Regex Tester

Regex Tester

Write a regular expression pattern, set optional flags, and type your test string — matches are highlighted in real time. Any syntax errors in the pattern are reported immediately.

Each pair of parentheses creates a capture group that you can read separately in the results.

Supported flags

• g — global: find all matches, not just the first
• i — case-insensitive: match regardless of letter case
• m — multiline: ^ and $ match start/end of each line
• s — dotAll: . matches newline characters too
• u — unicode: enables full Unicode matching
• y — sticky: match only from lastIndex

Quick regex reference

• . — any character except newline
• \d — digit [0–9]
• \w — word character [a–z A–Z 0–9 _]
• \s — whitespace
• ^ / $ — start / end of string (or line with m)
• * + ? — zero-or-more, one-or-more, optional
• {n,m} — between n and m repetitions
• (a|b) — alternation: a or b
• [abc] — character class
• (?=…) — positive lookahead