Regex Cheat Sheet

Any character except newline

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

Non-word character

Digit (0-9)

Non-digit

Whitespace (space, tab, newline, etc.)

Non-whitespace

Any character in the set (a, b, or c)

Any character NOT in the set

Any character in the range a to z

Start of string (or line in multi-line mode)

End of string (or line in multi-line mode)

Word boundary (between word and non-word characters)

Non-word boundary

Absolute start of string

Absolute end of string

Zero or more occurrences

One or more occurrences

Zero or one occurrence (optional)

Exactly n occurrences

n or more occurrences

Between n and m occurrences

Zero or more, lazy (match as few as possible)

One or more, lazy

Capture group (matches 'abc' and remembers the match)

Non-capturing group

Named capture group

Backreference to capture group 1

Alternation (a OR b)

Positive lookahead (matches if followed by 'abc')

Negative lookahead (matches if NOT followed by 'abc')

Positive lookbehind (matches if preceded by 'abc')

Negative lookbehind (matches if NOT preceded by 'abc')

Global search (find all matches, not just the first)

Case-insensitive search

Multi-line search (^ and $ match start/end of lines)

Dotall mode (. matches newlines)

Explore advanced configurations for Regex

Performance tuning best practices for Regex

Run security checks and validation for Regex