Regex Cheatsheet & Live Tester

Developer Utilities

Comprehensive regular expression (RegEx) reference cheatsheet with common patterns and a live testing sandbox.

Live Regex Tester

Matched (1)

Ready & Popular Regex Patterns

Email Address

Validates standard email formatting.

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

URL / Web Address

URLs starting with http/https protocols.

https?:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)

IPv4 Address

Valid IPv4 addresses between 0.0.0.0 and 255.255.255.255.

^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$

Hex Color Code

3 or 6 digit hex color codes like #FFF or #FFFFFF.

^#(?:[0-9a-fA-F]{3}){1,2}$

URL Slug Format

SEO-friendly slug with lowercase letters, digits, and hyphens.

^[a-z0-9]+(?:-[a-z0-9]+)*$

Strong Password

Min 8 chars: 1 uppercase, 1 lowercase, 1 digit, and 1 special char.

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

Token	Description	Example
.	Any single character except newline	a.c -> abc, a1c
\d	Any digit [0-9]	\d+ -> 42, 1984
\D	Any non-digit character	\D+ -> hello
\w	Word character (alphanumeric + underscore)	\w+ -> user_12
\W	Non-word character	\W -> @, #, !
\s	Whitespace character	\s+ -> " "
\S	Non-whitespace character	\S+ -> word
\t	Tab character	\t
\n	Newline character	\n
[abc]	Any character enclosed in brackets	[aeiou] -> sesli harfler
[^abc]	Any character NOT enclosed in brackets	[^0-9] -> rakam harici
[a-z]	Character range lowercase a to z	[a-z]+ -> kod
[A-Z]	Character range uppercase A to Z	[A-Z]+ -> TURK
[0-9]	Digit range 0 to 9	[0-9]{4} -> 2026
*	0 or more matches	a* -> "", "a", "aaa"
+	1 or more matches	a+ -> "a", "aaa"
?	0 or 1 match (optional)	colou?r -> color, colour
{n}	Exactly n matches	\d{4} -> 2026
{n,}	At least n matches	\d{3,} -> 100, 10000
{n,m}	Between n and m matches	\d{2,4} -> 99, 9999
*? / +?	Lazy / non-greedy match	<.*?> -> ilk kapanışa kadar
^	Start of string or line	^https -> https ile başlayan
$	End of string or line	\.json$ -> .json ile biten
\b	Word boundary	\bcat\b -> "cat" ("catch" değil)
\B	Non-word boundary	\Bcat -> "scatter"
(abc)	Capturing group	(\d{2})-(\d{2}) -> $1, $2
(?:abc)	Non-capturing group	(?:https?\|ftp)://
a\|b	Alternation (OR operator)	kırmızı\|mavi
(?=abc)	Positive lookahead	\d+(?=px) -> 100 (100px içindeki)
(?!abc)	Negative lookahead	\d+(?!px) -> px olmayan sayılar
(?<=abc)	Positive lookbehind	(?<=\$)\d+ -> $ sonrasındaki rakam
(?<!abc)	Negative lookbehind	(?<!\$)\d+ -> $ olmayan rakam

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How to Use Regex Cheatsheet & Live Tester

Search Rules

Filter regex tokens by category or search term.

Test Live

Use the live tester on top to test regex patterns against sample text.

Copy Pattern

Copy syntax rules or common patterns directly to your clipboard.

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