Regex Tester

How to Use

1. Enter a regex pattern and optional flags
2. Paste text to test against
3. Click "Test Regex" to see matches
4. Copy match results if needed

Features

• Instant match listing with indices
• Supports common regex flags
• Client-side testing for privacy

Regex Fundamentals

Regular expressions are pattern-matching rules used to search or transform text.

Safety and Accuracy Tips

• Escape special characters when you want a literal match (for example \.).
• Use anchors like ^ and $ when validating full input.
• Prefer Unicode-aware patterns for international text handling.
• Review complex patterns for performance on large inputs.

References

• MDN: Regular expressions in JavaScript