📚 Pattern Library (click to use)
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About Regular Expressions
Regular expressions (regex) are patterns used to match character combinations in strings. They're essential for:
- Form validation (emails, phone numbers, etc.)
- Search and replace operations
- Text parsing and extraction
- Data cleaning and formatting
- Log file analysis
Quick Reference
.- Matches any character except newline\d- Matches any digit (0-9)\w- Matches word characters (letters, digits, underscore)\s- Matches whitespace (space, tab, newline)*- Matches 0 or more of the previous element+- Matches 1 or more of the previous element?- Matches 0 or 1 of the previous element^- Start of string/line$- End of string/line[abc]- Matches any character in the set[^abc]- Matches any character NOT in the set(group)- Capturing group