Regex Tester

Test and debug JavaScript Regular Expressions in real time. Highlights matches, extracts numbered and named capture groups, and displays match start/end indices with timeout protection.

Test String2 Match(es) Found

Match Details & Capture Groups

Match #1Position: 19

[email protected]

Capture Groups:

$1:help

$2:epicdevtools.com

Match #2Position: 44

[email protected]

Capture Groups:

$1:sales

$2:example.org

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How it works

Enter your regex pattern and select flags (`g`, `i`, `m`, `s`, `u`).
Type or paste test text into the input area.
Matches and capture groups are computed and highlighted immediately.

Privacy & Processing Information

Tested locally in your browser. Catastrophic backtracking protection safeguards your tab.

No account, tracking, or file storage required.

Frequently Asked Questions

What do the regex flags mean?

`g` = global match (all occurrences), `i` = case insensitive, `m` = multiline anchor matching (`^` and `$`), `s` = dot matches newlines, `u` = full unicode support.