Regex Tester
What are Regular Expressions?
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Regex Tester & Builder
Matches
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Common Patterns
Regex Cheat Sheet
^Start of line$End of line.Any character except newline*0 or more+1 or more?0 or 1\wWord character [A-Za-z0-9_]\dDigit [0-9]\sWhitespace[abc]Character class(xyz)Capturing group{n}Exactly n times{n,}n or more times{n,m}Between n and m timesCommon Regex Patterns
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^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$Match email addresses
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URL
https?:\/\/[\w\-\.]+\.[a-zA-Z]{2,}(\/\S*)?Match web URLs
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Phone (US)
^\(?([0-9]{3})\)?[-.\s]?([0-9]{3})[-.\s]?([0-9]{4})$Match US phone numbers
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Date (YYYY-MM-DD)
^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$Match dates in YYYY-MM-DD format
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Understanding Regular Expressions
What are Regular Expressions?
Regular expressions (regex) are powerful patterns used to match and manipulate text. They provide a flexible way to search, validate, and transform strings.
Common Use Cases
- Validating email addresses and phone numbers
- Extracting data from structured text
- Finding and replacing patterns in text
- Parsing log files and data formats
Tips for Writing Regex
- Start simple and build up gradually
- Test with various input cases
- Use capturing groups to extract data
- Consider performance for large inputs