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Regex tester.
Live JavaScript regex matching with flags, capture-group tables and a cheatsheet. Input-capped for safety.
JS RegExp
Pattern2 matches
Matches63 chars in
Groups · first match
| $1 | aisha |
| $2 | example.com |
| ?‹user› | aisha |
| ?‹host› | example.com |
Cheatsheet
. — any char
\d — digit
\w — word char
\s — whitespace
* — 0+
+ — 1+
? — 0/1
{2,4} — repeat
^…$ — anchors
(…) — group
(?:…) — non-group
a|b — either
[a-z] — range
[^…] — negate
\b — boundary
(?<n>…) — named
How to use.
- Type a pattern — matches highlight live with a count.
- Toggle flags g/i/m/s/u/y and inspect the group table.
- Use the cheatsheet for syntax you forget monthly.
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