RegEx Tester

Test and Debug Regular Expressions

A powerful regex testing tool with live match highlighting, capture group support, and a library of common patterns. Essential for developers working with text parsing, validation, or search patterns.

How to Use

Enter your regex pattern in the pattern field, or select a common pattern from the dropdown. Paste your test string in the text area and see matches highlighted instantly. Toggle flags (global, case-insensitive, multiline, etc.) to modify matching behavior. View detailed match information including capture groups below.

Features

• Live Highlighting – Matches are highlighted in real-time as you type
• Regex Flags – Toggle g (global), i (case-insensitive), m (multiline), s (dotall), and u (unicode)
• Common Patterns – Quick-select patterns for emails, URLs, phone numbers, IP addresses, and more
• Capture Groups – View numbered and named capture groups for each match
• Match Details – See match count, positions, and full match information
• Error Handling – Clear error messages for invalid regex patterns