What flags are supported?

g (global), i (case-insensitive), m (multiline), and s (dotAll) can be toggled individually.

How do capture groups appear?

Each capture group within a match is highlighted in a distinct contrasting color and listed in the match details table.

Can I test replacements?

Yes — enable Replace mode, enter a replacement string (use $1, $2 for groups), and the result is shown below the test string.

What if my pattern is invalid?

An error message appears immediately below the pattern input explaining the syntax error.

Developer 無料サインアップ不要

Regex Match Visualizer

Visual regex testing with color-highlighted matches and capture groups.

ツールを読み込み中…

このツールについて

Test regular expressions with instant visual feedback. Paste your pattern and test string to see every match highlighted in a distinct color. Capture groups are shown in contrasting shades within each match. A match details table lists position, value, and named or numbered groups for every hit. Toggle flags (g, i, m, s) with checkboxes. Switch to Replace mode to preview the result of String.replace. A Quick Reference panel provides common patterns (email, URL, phone, date, hex color, etc.) with a one-click 'Use' button. RegExp errors are displayed immediately with a clear message.

使い方

1 Enter your regular expression in the pattern field.
2 Toggle flags as needed (g for global, i for case-insensitive, etc.).
3 Type or paste a test string — matches highlight instantly.
4 Review the match details table for positions and capture groups.
5 Enable Replace mode to preview substitution results.
6 Use the Quick Reference panel for common patterns.

このツールについて

使い方

よくある質問