Regular Expression Tester

Test and debug regular expressions with real-time matching, capture groups visualization, and common pattern library.

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Total Matches: 0

Pattern Length: 0

Text Length: 0

Execution: -

Common Patterns

Quick Reference

Pattern	Description
`.`	Any character except newline
`\d`	Digit (0-9)
`\w`	Word character (a-z, A-Z, 0-9, _)
`\s`	Whitespace
`^`	Start of string/line
`$`	End of string/line
`*`	0 or more repetitions
`+`	1 or more repetitions
`?`	0 or 1 repetition
`{n}`	Exactly n repetitions
`{n,m}`	Between n and m repetitions
`[abc]`	Any of a, b, or c
`[^abc]`	Not a, b, or c
`(abc)`	Capture group
`(?:abc)`	Non-capturing group
`a\|b`	a or b
`\b`	Word boundary

About Regular Expressions

Regular expressions (regex) are powerful patterns used to match character combinations in strings. They're essential for text processing, validation, and search operations.

Common Use Cases:

Validation: Email addresses, phone numbers, passwords
Extraction: URLs, dates, numbers from text
Search & Replace: Find and replace patterns in text
Parsing: Log files, CSV data, structured text

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