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Regex Cheatsheet

Regex Cheatsheet

Quick reference for regular expression syntax and patterns

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Essential Regex

.any char

*0+ times

+1+ times

?optional

\ddigit

\wword char

Patterns42 of 42 patterns

.

Any character except newline

h.t matches "hat", "hot", "hit"

\d

Digit (0-9)

\d+ matches "123" in "abc123"

\D

Non-digit

\D+ matches "abc" in "abc123"

\w

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

\w+ matches "hello_world"

\W

Non-word character

\W matches spaces and punctuation

\s

Whitespace

\s+ matches spaces, tabs, newlines

\S

Non-whitespace

\S+ matches "hello" in " hello "

[abc]

Character set

[aeiou] matches any vowel

[^abc]

Negated set

[^aeiou] matches any consonant

[a-z]

Range

[a-zA-Z] matches any letter

*

Zero or more

ab*c matches "ac", "abc", "abbc"

+

One or more

ab+c matches "abc", "abbc" but not "ac"

?

Zero or one

colou?r matches "color" and "colour"

{n}

Exactly n times

\d{4} matches "2024"

{n,}

n or more times

\d{2,} matches "12", "123", "1234"

{n,m}

Between n and m times

\d{2,4} matches "12" to "1234"

*?

Zero or more (lazy)

<.*?> matches "<b>" in "<b>bold</b>"

+?

One or more (lazy)

Minimal matching

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