Regex Tester

Test regular expressions with live match highlighting and capture group table.

Your data stays on your deviceNo upload, no serverWorks offline

Presets:

PatternFlags

g — globali — case insensitivem — multilines — dot all

Test string

Matches:2

Highlighted output

Send inquiries to hello@example.com or ops@toolgrid.app

Why use this tool

Build and test regex patterns with flags, highlighted matches, and capture group inspection.

Regex Tester highlights all matches in real time as you type your pattern.

Capture groups appear in a table below, and preset patterns let you start quickly.

01Enter or choose a preset pattern.

02Set flags (g, i, m, s) as needed.

03Paste test text and see matches highlighted with cycling colors.

Confirm the input is the format you intended.

Scan the result before using it in a document, URL, config, or message.

Copy only the output you need.

01
Validate before copying
If the input parser reports an error, fix the source value first instead of copying a partial result into code, config, or documentation.
02
Keep secrets local
The tool runs in your browser, but you should still avoid pasting long-lived production secrets into any shared or screen-recorded session.

What flags are supported?

g (global), i (case-insensitive), m (multiline), and s (dotAll).

How many matches does it find?

Up to 500 matches per test to keep the UI responsive.

Does it show named capture groups?

It shows numbered capture groups. Named groups are shown by their position.

Replace every match in pasted text — case-sensitive toggle, instant match count, nothing leaves your browser.

Compare two text blocks and see additions, deletions, and changes — switchable between line, word, and character granularity.

Parse CRON expressions, describe them in plain language, and preview the next 10 runs.