Regex Tester

Test regular expressions in real-time with match highlighting, groups display, and a comprehensive common patterns library.

Enter a regex pattern, set flags, and test against your string. Use the common patterns library for quick access to frequently used regex.

Regular Expression Pattern

Flags

Global - find all matches

Case-insensitive - ignore case

Multiline - ^ and $ match line boundaries

Dotall - . matches newlines

Unicode - treat pattern as Unicode

Sticky - match from lastIndex only

Common Patterns Library

Email & Web

Numbers & IDs

Date & Time

Network

Code

Security

Text Patterns

Test String

Regex Tips

• Use the g flag to find all matches (not just the first)
• Use () to create capture groups
• Use . to match any character
• Use * for 0 or more, + for 1 or more
• Use \\b for word boundaries
• Try the common patterns library for quick access to tested regex

Quick Reference

Character Classes

. - Any character

\d - Digit (0-9)

\w - Word (a-z, A-Z, 0-9, _)

\s - Whitespace

Quantifiers

* - 0 or more

+ - 1 or more

? - 0 or 1

{n,m} - Between n and m

Anchors

^ - Start of string

$ - End of string

\b - Word boundary

\B - Not word boundary

Text Tools Suite

Diff Checker

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Regex Tester

Test regular expressions in real-time with match highlighting, groups display, and a comprehensive common patterns library.

Enter a regex pattern, set flags, and test against your string. Use the common patterns library for quick access to frequently used regex.

Regular Expression Pattern

Flags

Global - find all matches

Case-insensitive - ignore case

Multiline - ^ and $ match line boundaries

Dotall - . matches newlines

Unicode - treat pattern as Unicode

Sticky - match from lastIndex only

Common Patterns Library

Email & Web

Numbers & IDs

Date & Time

Network

Code

Security

Text Patterns

Test String

Regex Tips

• Use the g flag to find all matches (not just the first)
• Use () to create capture groups
• Use . to match any character
• Use * for 0 or more, + for 1 or more
• Use \\b for word boundaries
• Try the common patterns library for quick access to tested regex

Quick Reference

Character Classes

. - Any character

\d - Digit (0-9)

\w - Word (a-z, A-Z, 0-9, _)

\s - Whitespace

Quantifiers

* - 0 or more

+ - 1 or more

? - 0 or 1

{n,m} - Between n and m

Anchors

^ - Start of string

$ - End of string

\b - Word boundary

\B - Not word boundary

Text Tools Suite

Diff Checker

Back to Utilities

Regex Tester

Quick Reference

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Regex Tester

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