Regular Expressions 101

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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

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Community Patterns

if, else if, else condtion match

RegExExample

RFC 5322 email validation

Domain Name .CZ - only 2th level format

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CSV line parsing

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Simple script command and parameter grabber

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Finding URLs within full text

how to extract that 87% ??

Tv Series name extractor

Community Library Entry

Regular ExpressionPCRE (PHP <7.3)

Description

Regular Expression
PCRE (PHP <7.3)