Regular Expression Tester

Features Overview

Test regular expressions in real-time in your browser with match highlighting, replacement preview, preset patterns library, and syntax reference.

Tool Description

Supports regex matching, replacement, preset pattern library and syntax reference, real-time highlighting of matching results, performance testing and history records.

Capabilities Checklist

• Support all 6 regex flags: g (global), i (case-insensitive), m (multiline), s (single-line), u (Unicode), y (sticky).
• Real-time match result highlighting with position information, capture groups, and named capture group details.
• Preset pattern library includes: email, URL, phone, date, IPv4, color code, ID card, and more.
• Text replacement preview with real-time result display.
• Built-in comprehensive regex syntax reference with flag descriptions and common pattern quick reference.
• Display execution time to help optimize regex performance.
• Save the last 20 test records locally with the ability to restore or delete at any time.
• Quick examples feature to load common regex test cases with one click.