Our Regex Tester & Debugger is a comprehensive, free online tool designed for developers, data analysts, and anyone working with regular expressions. Whether you're validating user input, parsing data, or debugging complex patterns, this tool provides real-time feedback and detailed analysis.

Key Features:

• Real-time Pattern Matching: Instant regex testing as you type with immediate visual feedback
• Multiple Flag Support: Global (g), case-insensitive (i), and multiline (m) flags
• Common Patterns Library: Pre-built patterns for email, phone, URL, IP address, dates, and colors
• Match Highlighting: Visual highlighting of matches in your test text
• Detailed Analysis: Match statistics, position data, and pattern validity checking
• Export & Copy: Copy matches to clipboard or export detailed results as JSON
• Error Detection: Syntax error detection with clear error messages
• Sample Text Loading: Quick sample data for testing patterns

Perfect For:

• Web developers validating user input and form data
• Data analysts parsing and extracting information from text
• Backend developers working with string processing and validation
• Students learning regular expressions and pattern matching
• Quality assurance testers validating text processing features
• Content creators working with text transformation and cleanup
• Anyone needing to test regex patterns before implementation

Understanding Regex Flags:

Regular expression flags modify how patterns behave. The Global flag (g) finds all matches instead of stopping at the first one. The Ignore Case flag (i) makes matching case-insensitive, treating "Hello" and "hello" as the same. The Multiline flag (m) changes how the start (^) and end ($) anchors work, making them match the beginning and end of each line rather than the entire string.

1. Enter your regex pattern: Type your regular expression in the pattern field. Use backslashes to escape special characters. Click on common patterns to load pre-built examples for email, phone numbers, URLs, and more.
2. Configure flags: Select the appropriate flags for your needs:
   • Global (g): Find all matches, not just the first one
   • Ignore case (i): Case-insensitive matching
   • Multiline (m): Treat ^ and $ as line boundaries
3. Add test text: Paste your test text in the text area or click "Load Sample Text" to get example data with emails, phone numbers, URLs, and dates for testing.
4. Analyze results: View real-time match highlighting, detailed statistics (total matches, unique matches, pattern validity), and individual match details with positions.
5. Export and use: Copy matches to clipboard for immediate use or export detailed results as JSON for documentation, sharing, or further analysis.