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REGEX CHEATSHEET

Quick reference for regular expression syntax. Common patterns and examples.

Character Classes

Pattern	Description
`.`	Any character except newline
`\d`	Digit (0-9)
`\D`	Not a digit
`\w`	Word character (a-z, A-Z, 0-9, _)
`\W`	Not a word character
`\s`	Whitespace
`\S`	Not whitespace

Anchors

Pattern	Description
`^`	Start of string
`$`	End of string
`\b`	Word boundary
`\B`	Not word boundary

Quantifiers

Pattern	Description
`*`	0 or more
`+`	1 or more
`?`	0 or 1
`{3}`	Exactly 3
`{3,}`	3 or more
`{3,5}`	Between 3 and 5

Groups & Lookaround

Pattern	Description
`(abc)`	Capture group
`(?:abc)`	Non-capturing group
`(?=abc)`	Positive lookahead
`(?!abc)`	Negative lookahead

Common Patterns

Pattern	Description
`[a-z]`	Lowercase letter
`[A-Z]`	Uppercase letter
`[0-9]`	Digit
`[a-zA-Z]`	Any letter
`[^abc]`	Not a, b, or c

Example Patterns

Email:

[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}

URL:

https?://[^\s/$.?#].[^\s]*

Phone (US):

\d{3}-\d{3}-\d{4}

Hex Color:

#[0-9a-fA-F]{6}