Regex Tester

Write and test regex patterns with sample input, flags, matches, groups, and replace.

Regex Tester

JavaScript (ECMAScript) regular expressions.

Max processed: 100,000 characters. Matches capped at 1,000.

Use $1, $2… for numbered groups, $& full match, $<name> for named groups.

replace output

—
flags: /g/ • matches: 1• time: 0 ms

highlight

matches & groups

#1 [0–0):

positional groups

  • —

named groups

  • —

matches (JSON)

[
  {
    "match": "",
    "index": 0,
    "groups": {},
    "captures": []
  }
]