Regular Expressions 101

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Community Patterns

13

PHP variable name

PCRE (PHP <7.3)
Valid PHP variable name as defined in the manual at http://php.net/manual/en/language.variables.basics.php
Submitted by Erin Millard - 12 years ago
52

Disorted Email Addresses

PCRE (PHP <7.3)
Matches distorted email addresses and converts them back to real ones.
Submitted by dislick - 12 years ago
40

URL regexp

PCRE (PHP <7.3)
A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.
Submitted by Matthew O'Riordan - 12 years ago
1...900901902

Community Library Entry

1

Regular Expression
ECMAScript (JavaScript)

/
^\({1,4}[9][\*\-\+\/][9]\)?[\*\-\+\/][9]\){0,2}[\*\-\+\/][9]\){0,1}
/
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Description

Using exactly four 9s and no other digits, write an equation which evaluates to 100

Submitted by GMiller - 9 years ago