Regex Tester
Test regular expressions in real-time. Match, replace, and split with live highlighting. Supports all JavaScript regex flags.
Embed this tool//g
Valid regex
Results(6 matches)
Hello World! This is a Test string with Multiple Words.
Match 1: Hello
Group 1: H
Match 2: World
Group 1: W
Match 3: This
Group 1: T
Match 4: Test
Group 1: T
Match 5: Multiple
Group 1: M
Match 6: Words
Group 1: W
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Regex Cheat Sheet
Character Classes
- . — any character
- \d — digit
- \w — word char
- \s — whitespace
- [abc] — any of a,b,c
Anchors & Quantifiers
- ^ — start of string
- $ — end of string
- * — 0 or more
- + — 1 or more
- ? — 0 or 1
- {n,m} — between n and m
Groups & Lookarounds
- (abc) — capture group
- (?:abc) — non-capturing
- (?=abc) — lookahead
- (?!abc) — negative lookahead
- (?<=abc) — lookbehind
Special
- \b — word boundary
- | — OR operator
- \1 — backreference
- \n — newline
- \t — tab
Frequently Asked Questions
This tester uses JavaScript regular expressions (ECMAScript standard). It supports all modern features including lookaheads, lookbehinds, named capture groups, and the dotAll (s) flag.