Regex Tester

Test and debug regular expressions with real-time matching, highlighting, and detailed match information.

Regular Expression

Enter your regex pattern and select flags

Flags:

g- Global - Find all matchesi- Ignore case - Case insensitive matchingm- Multiline - ^ and $ match line breakss- Dotall - . matches newlinesu- Unicode - Full unicode supporty- Sticky - Match from lastIndex only

Valid regex - 0 matches found

Test String

Enter the text you want to test against your regex

Length: 0 characters

Results

Highlighted matches and match details

Test results will appear here...

Common Patterns

Click to load popular regex patterns

Quick Reference

Character Classes:
. - Any character
\d - Digit
\w - Word character
\s - Whitespace

Quantifiers:
* - 0 or more
+ - 1 or more
? - 0 or 1
{n,m} - Between n and m

Anchors:
^ - Start of line
$ - End of line
\b - Word boundary

Tips

Test incrementally: Build your regex step by step to understand how each part works.

Use capturing groups: Parentheses create groups that can be referenced in matches.

Escape special characters: Use backslashes to match literal special characters.

Consider performance: Complex patterns can be slow on large texts.

Features

Comprehensive regex testing and debugging

Real-time Testing

See results instantly as you type

Match Highlighting

Visual highlighting of regex matches

Group Details

Detailed information about capture groups

Common Patterns

Pre-built patterns for common use cases