Text tool

Regex Studio

Build and test JavaScript regex patterns with live matching, groups, and replace preview.

Regex patternFlags

How flags work

Flags change how the regex engine searches text. You can combine multiple flags (example: gm).\ng = global (find all matches, not only the first)\ni = case-insensitive (A matches a)\nm = multiline (^ and $ work per line)\ns = dotAll (. also matches new lines)\nu = unicode-aware matching\ny = sticky (next match must start at lastIndex)

Replacement

Input textReplace preview

Invoice:A-1001 - amount: 45.99 EUR
Invoice:B-1002 - amount: 128.50 EUR
Contact: billing@example.com

Matches: 2

Input chars: 97

Output chars: 99

Detected matches

#1 at index 0: Order #A-1001
Groups: $1=A-1001
#2 at index 34: Order #B-1002
Groups: $1=B-1002

All analysis runs in your browser. No text is uploaded.

Live Match Testing

See every match position and value update instantly while typing pattern, flags, or text.

Replace Preview

Validate replacement strings with capture groups before using them in code or data cleanup.

Private by Default

Everything executes locally with JavaScript RegExp. Your data remains on your device.

Regex Studio

Detected matches

Live Match Testing

Replace Preview

Private by Default

Tags

Related tools