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Regex Tester (Match/Groups/Replace Preview)

Q: "What are the g/i/m flags?"

"Toggle them via the checkboxes. (g=global, i=ignore case, m=multiline)"

Q: "Can I test replacements?"

"Enter a replacement string to see the Replace tab update. $1-style group references work too."

Q: "Is this different from PCRE?"

"Yes. This tool uses JavaScript regex, so some patterns behave differently than PCRE."

A regex tester you can use instantly—paste your pattern and text and confirm the result in one screen. Matches are highlighted, and capture groups plus replacement previews are shown together.

Everything runs locally in your browser. Nothing is sent to a server.

Regex

/ /

Evaluated with JavaScript (ECMAScript) regex. Behavior may differ from PCRE.

Flags

g i மீட்டர்

Details

s dotAll u unicode y sticky

g/i/m are the basics. Open details for extra flags.

Replace Use $1, $2 for groups. $& is the full match.

Show replacement

Input text

Paste the text you want to test

Highlights

Matched ranges are highlighted

Matches: {count} / Time: {ms}ms / Anchored: {anchor} / Replace: {replace} / Mode: {mode}

முடிவுகள்

Select a match

No matches to show groups.

Group	பெயர்	மதிப்பு

விருப்பங்கள்

Auto run

Run on every input change

Sync scroll

Keep input and highlights aligned

Line numbers

Show line numbers

Highlight limit

Reduce load for large matches

Match list limit

Limit the list for performance

பயன்படுத்தும் முறை

Enter a pattern

Type your regex and pick the flags you need.

Paste input text

Highlights appear on the right as you type.

Review results

Check matches, groups, and replacements in the tabs.

Samples Apply pattern, flags, and replacement

குறிப்புகள்

This tool evaluates JavaScript regex.

Some PCRE-only features (like atomic groups) are not available.
Named groups and lookbehind can differ by environment.
Results are not guaranteed to match PCRE exactly.

Important

Verify results before production use because PCRE behavior can differ.

கேள்வி பதில்கள்

What are the g/i/m flags?

Toggle them via the checkboxes. (g=global, i=ignore case, m=multiline)

Can I test replacements?

Enter a replacement string to see the Replace tab update. $1-style group references work too.

Is this different from PCRE?

Yes. This tool uses JavaScript regex, so some patterns behave differently than PCRE.

Regex Tester (Match/Groups/Replace Preview)

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