Is Regex Cheatsheet free to use?

Yes, Regex Cheatsheet is completely free to use on UtilityCove.

Does Regex Cheatsheet upload my data?

No. Regex Cheatsheet runs in your browser, so your input stays on your device.

Yes. Regex Cheatsheet works on modern mobile and desktop browsers.

A complete JavaScript regex reference — anchors, classes, quantifiers, groups, flags, and common patterns.

Pattern	Description	Example
`^`	Start of string (or line in multiline mode)	^Hello matches 'Hello world'
`$`	End of string (or line in multiline mode)	world$ matches 'Hello world'
`\b`	Word boundary	\bcat\b matches 'cat' but not 'scatter'
`\B`	Non-word boundary	\Bcat matches 'scatter'
`\A`	Start of string (not supported in JS — use ^)	Use ^ in JavaScript
`\Z`	End of string (not supported in JS — use $)	Use $ in JavaScript

Pattern	Description	Example
`.`	Any character except newline	a.c matches 'abc', 'a1c'
`\d`	Digit [0-9]	\d+ matches '123'
`\D`	Non-digit [^0-9]	\D+ matches 'abc'
`\w`	Word character [a-zA-Z0-9_]	\w+ matches 'hello_42'
`\W`	Non-word character	\W matches spaces and symbols
`\s`	Whitespace (space, tab, newline)	\s+ matches ' '
`\S`	Non-whitespace	\S+ matches 'hello'
`[abc]`	Character set — matches a, b, or c	[aeiou] matches vowels
`[^abc]`	Negated set — any character except a, b, or c	[^0-9] matches non-digits
`[a-z]`	Range — any lowercase letter	[a-zA-Z] matches any letter
`[\u0041-\u005A]`	Unicode range	Matches A-Z via Unicode

Pattern	Description	Example
`*`	Zero or more (greedy)	a* matches '', 'a', 'aaa'
`+`	One or more (greedy)	a+ matches 'a', 'aaa'
`?`	Zero or one (optional)	colou?r matches 'color' or 'colour'
`{n}`	Exactly n occurrences	\d{4} matches '2024'
`{n,}`	n or more occurrences	\d{2,} matches '12', '123'
`{n,m}`	Between n and m occurrences	\d{2,4} matches '12', '123', '1234'
`*?`	Zero or more (lazy)	<.*?> matches first tag only
`+?`	One or more (lazy)	Stops as early as possible
`??`	Zero or one (lazy)	Prefers zero match

Pattern	Description	Example
`(abc)`	Capturing group	(\d+) captures digits
`(?:abc)`	Non-capturing group	(?:abc)+ groups without capture
`(?<name>abc)`	Named capturing group	(?<year>\d{4})
`\1`	Backreference to group 1	(\w)\1 matches 'aa', 'bb'
`\k<name>`	Named backreference	\k<year> references named group
`(?=abc)`	Positive lookahead — followed by	\d(?=px) matches digit before 'px'
`(?!abc)`	Negative lookahead — not followed by	\d(?!px) matches digit not before 'px'
`(?<=abc)`	Positive lookbehind — preceded by	(?<=\$)\d+ matches digits after $
`(?<!abc)`	Negative lookbehind — not preceded by	(?<!\$)\d+ matches digits not after $
`a\|b`	Alternation — a or b	cat\|dog matches 'cat' or 'dog'

Pattern	Description	Example
`g`	Global — find all matches (not just first)	/a/g matches all 'a's
`i`	Case-insensitive matching	/hello/i matches 'HELLO'
`m`	Multiline — ^ and $ match line starts/ends	/^foo/m matches 'foo' at start of any line
`s`	Dotall — . matches newlines too	/a.b/s matches 'a\nb'
`u`	Unicode mode — enables full Unicode support	/\u{1F600}/u matches emoji
`y`	Sticky — match only from lastIndex position	Used with regex.lastIndex
`d`	Indices — include match start/end indices	ES2022: match.indices

Pattern	Description	Example
`\n`	Newline	Split on \n
`\r`	Carriage return	Windows line endings \r\n
`\t`	Tab character	Matches tab-separated values
`\0`	Null character	Binary data delimiter
`\uXXXX`	Unicode escape (4 hex digits)	\u0041 matches 'A'
`\u{XXXXX}`	Unicode escape (with u flag)	\u{1F600} matches emoji
`\xHH`	Hex escape (2 hex digits)	\x41 matches 'A'
`\\`	Literal backslash	Matches '\'
`\.`	Literal dot	version\.js matches 'version.js'

Pattern	Description	Example
`^[\w.-]+@[\w.-]+\.\w{2,}$`	Email address (basic)	user@example.com
`https?:\/\/[\w\-._~:/?#[\]@!$&'()*+,;=%]+`	URL (http/https)	https://example.com
`\b(?:\d{1,3}\.){3}\d{1,3}\b`	IPv4 address	192.168.1.1
`^\d{4}-\d{2}-\d{2}$`	ISO date (YYYY-MM-DD)	2024-03-15
`^#(?:[0-9a-fA-F]{3}\|[0-9a-fA-F]{6})$`	Hex color code	#FF6B35 or #f60
`^\+?[1-9]\d{1,14}$`	International phone (E.164)	+31612345678
`^[A-Z]{2}\d{2}[A-Z0-9]{4,}$`	IBAN (basic structure)	GB82WEST12345698765432
`^(?=.[a-z])(?=.[A-Z])(?=.*\d).{8,}$`	Strong password (8+ chars, upper, lower, digit)	Password1
`^\d{5}(?:-\d{4})?$`	US ZIP code	12345 or 12345-6789
`[^\x00-\x7F]`	Non-ASCII characters	Matches accents, emojis, CJK
`^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$`	UUID v4	550e8400-e29b-41d4-a716-446655440000
`^\s+\|\s+$`	Leading/trailing whitespace	Use with .replace() to trim