Regex Cheatsheet

Runs locally

A quick reference of regex character classes, quantifiers, anchors, groups and flags

DEV TOOLS

Character classes

.

Any single character except newline

a.c → abc

\d

A single digit

\d{3} → 123

\w

Letter, digit or underscore

\w+ → abc_1

\s

Any whitespace character

a\sb → a b

[abc]

Any one character in the set

[aeiou] → e

[^abc]

Any character not in the set

[^0-9] → a

[a-z]

Any character in the range

[A-F] → C

Quantifiers

*

Zero or more times

ab* → abbb

+

One or more times

ab+ → abbb

?

Zero or one time

colou?r → color

{n,m}

Between n and m times

\d{2,4} → 2024

*?

Lazy match, as few as possible

<.*?> → <b>

Anchors and boundaries

^

Start of the string

^Hello

$

End of the string

world$

\b

Word boundary

\bword\b

Groups and lookaround

( )

Numbered capturing group

(\d+)-(\d+)

(?: )

Group without capturing

(?:ab)+

(?<name> )

Named capturing group

(?<year>\d{4})

a|b

Match either alternative

cat|dog

(?= )

Positive lookahead

\d(?=px)

Flags

g

Match all occurrences

/a/g

i

Case-insensitive matching

/abc/i

m

Multi-line mode

/^a/m

s

Let the dot match newlines

/a.b/s

How to use

1
Paste or type the content you want to process
2
Pick your options (indent size, key sorting and more)
3
Check the result and copy it in one click

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