Regex Tester

How to Use the Regex Tester

1. Enter your regular expression pattern in the pattern input field.
2. Select the flags you need: global (g), case-insensitive (i), multiline (m), or dotAll (s).
3. Type or paste your test string into the text area below.
4. Matches are highlighted in real-time with full details including capture groups.

Supported Flags

• g (global) -- Find all matches rather than stopping after the first
• i (case-insensitive) -- Match letters regardless of case
• m (multiline) -- ^ and $ match the start/end of each line
• s (dotAll) -- Dot (.) also matches newline characters

Features

• Real-time match highlighting as you type
• Capture group extraction with index positions
• Named capture group support
• Graceful error handling for invalid patterns
• 100% client-side processing for full privacy
• No data stored, no sign-up required