Regular Expressions 101

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238

Matching email addresses per RFC5322

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.

Submitted by Michael Musson - 11 years ago

483

regex101.com permalink id grabber

PCRE (PHP <7.3)

Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.

Submitted by chris mccoy - 11 years ago (Last modified 8 months ago)

1...900 901 902

Community Library Entry

Regular Expression
PCRE (PHP <7.3)

^(((((((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)|(((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?"((\s? +)?(([!#-[\]-~])|(\$[ -~]|\s))))*(\s? +)?"))?)?(((((\s? +)?(\(((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?<(((((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?(([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+(\.([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+)*)((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)|(((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?"((\s? +)?(([!#-[\]-~])|(\$[ -~]|\s))))*(\s? +)?"))@((((((\s? +)?(\(((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?(([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+(\.([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+)*)((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)|(((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?\[((\s? +)?([!-Z^-~]))*(\s? +)?\]((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)))>((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?))|(((((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?(([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+(\.([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+)*)((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)|(((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?"((\s? +)?(([!#-[\]-~])|(\$[ -~]|\s))))*(\s? +)?"))@((((((\s? +)?(\(((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?(([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+(\.([A-Za-z0-9!#-'*+\/=?^_`{|}~-])+)*)((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?)|(((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?\[((\s? +)?([!-Z^-~]))*(\s? +)?\]((((\s? +)?($((\s? +)?(([!-'*-[\]-~]*)|(\\([ -~]|\s))))*(\s? +)?$))(\s? +)?)|(\s? +))?))))$

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Description

Unsatisfied with your email validation? Concerned about standards compliance? Worried about that one weird edge case? Want to stress-test your regex engine? This might be the regex for you!

Submitted by Blake Thomas - 10 years ago