Regex Tester

Test and debug regular expressions instantly. Enter a regex pattern, paste your test text, choose your flags, and see live matches, capture groups, and errors directly in your browser.

Current result

Ready Enter a pattern and test text to begin

Pattern

Regular expression Enter the pattern only. Do not include surrounding slashes.

Flags

g global i case-insensitive m multiline s dotAll u unicode y sticky

Test text

Text to test

Common examples

Preview

Highlighted matches

Results

Match details

0 matches

Matches 0

Pattern length 0

Flags g

Text length 0

#	Start	Length	Match	Capture groups

Guide

How to use this regex tester

4 steps

1. Add a pattern

Type the regex pattern without wrapping it in slash characters.

2. Paste text

Add the content you want to test in the text area.

3. Choose flags

Toggle global, case-insensitive, multiline, dotAll, unicode, or sticky matching.

4. Inspect matches

Use the highlighted preview and match table to check positions, lengths, and capture groups.

Why test

Why use a regex tester?

Debug first

Small regex mistakes can cause missed matches, incorrect validation, or broken data extraction. Live testing helps you spot those issues before the pattern is used in code, forms, imports, or automation.

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