Regex Tester

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

🧪 Regex Tester

Sample Input

Auto-run

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

Replacement (optional)

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

Replace Output

—

Flags: /g/ • Matches: 1• Time: 0 ms

Highlighted Match

Matches & Groups

#1 [0–0):

Positional Groups

Named Groups

Matches (JSON)

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