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Top Regular Expressions

PAN
case number
4 characters , 1st alphabets starts with a or p remaining numeric
Thuan test 1
Treebark Campaign
Tomcat rewrite
Date Input
Gumtree price match
CNPJ mask
+
popular regex
SQL Formatter
Mcd Exclusions Overlap
Expresion_recurso_web
NA telephone number
OpenNos Latin+Han+Thai characters
Id Regex
Identify text between two patterns
AMC - Local Administrators
Lazy Search

Cheat Sheet

Character classes
. any character except newline
\w \d \s word, digit, whitespace
\W \D \S not word, digit, whitespace
[abc] any of a, b, or c
[^abc] not a, b, or c
[a-g] character between a & g
Anchors
^abc$ start / end of the string
\b word boundary
Escaped characters
\. \* \\ escaped special characters
\t \n \r tab, linefeed, carriage return
\u00A9 unicode escaped ©
Groups & Lookaround
(abc) capture group
\1 backreference to group #1
(?:abc) non-capturing group
(?=abc) positive lookahead
(?!abc) negative lookahead
Quantifiers & Alternation
a* a+ a? 0 or more, 1 or more, 0 or 1
a{5} a{2,} exactly five, two or more
a{1,3} between one & three
a+? a{2,}? match as few as possible
ab|cd match ab or cd