Regular Expressions 101

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Community Patterns

1

lore accuraten't email parser fetcher detective

PCRE2 (PHP >=7.3)
this will run in any flavor but python in regex101. based on wikipedia bugs: local part can have more than 64 chars if we abuse . or other things
Submitted by fbd_1 - a day ago (Last modified a day ago)
1

URI(or URL) parser

PCRE2 (PHP >=7.3)
A fully? complete Uniform Resource Identifier/Locator parser for all your need. it should support theses flavors with some changes or by using a different delimiter: PRCE2/PRCE, ECMAscript and should be able to support RUST, JAVA, GOLANG, .NET flavors with ease. for PYTHON, I don't really know.
Submitted by fbd_1 - 2 days ago
1

Canadian Postal Code Validation

ECMAScript (JavaScript)
Postal code format validation based on Canada Post Addressing Guidelines Accepts optional space or hyphens
Submitted by usrrname - 2 days ago (Last modified 2 days ago)
1

Extract links from text

PCRE2 (PHP >=7.3)
Extract links from text simple as that.
Submitted by anonymous - 4 days ago
1

Telephone number validation

PCRE2 (PHP >=7.3)
This validates any mobile or landline phone number in the world.
Submitted by kdesilva - 5 days ago
1

Repeated characters

PCRE2 (PHP >=7.3)
remove repeated characters from a string
Submitted by Vishal Kumar - 5 days ago
1

Regex for Matching Documentation Websites

ECMAScript (JavaScript)
Regex for Matching Documentation Websites This repository contains a powerful regular expression designed to match URLs that commonly point to documentation-related websites. The regex is optimized for flexibility, covering various terms and URL patterns. Regex Pattern ...
Submitted by jgeofil - 7 days ago
1

CIMTS business situation

PCRE2 (PHP >=7.3)
just playing around
Submitted by Jeremiah - 8 days ago
1

Any Unicode dash or its HTML escaped version

ECMAScript (JavaScript)
Match any of the weird dashes people figure out how to put in their data
Submitted by anonymous - 11 days ago (Last modified 11 days ago)
1

simple email checker

PCRE2 (PHP >=7.3)
sees if it is a proper email or not
Submitted by anonymous - 11 days ago
1

Finite automata Definition

PCRE2 (PHP >=7.3)
Parses and groups elements inside the definition of a finite automaton, defined by the following backus naur form state ::= [a-zA-Z]+ set_of_final_states ::= "final states" = {state} simbol ::= [a-zA-Z]...
Submitted by viktorashi - 11 days ago
1

Finite automata definition

PCRE2 (PHP >=7.3)
parses and groups elements inside the definition of a finite automaton, defined by the following backus naur form state ::= [a-zA-Z]+ set_of_final_states ::= "final states" = {state} simbol ::= [a-zA-Z]...
Submitted by anonymous - 11 days ago
1

Set of Finite Automata final states

PCRE2 (PHP >=7.3)
it parses and groups the final states of a finate automaton
Submitted by viktorashi copil borfashi - 11 days ago
1

english sentence tokenizer

PCRE2 (PHP >=7.3)
This is an english sentence tokenizer; it tokenizes correct english sentences. This can be done in a very short, "regex" string. Incorrect sentence examples be like: awesome thats so cool!...
Submitted by anonymous - 14 days ago
1

Clean unnecessary white spaces from JSON

PCRE2 (PHP >=7.3)
transform formatted JSON to one line by removing unneeded spaces.
Submitted by anonymous - 14 days ago (Last modified 14 days ago)
1

Match router

PCRE2 (PHP >=7.3)
Match for match everything between x and x
Submitted by anonymous - 15 days ago
1

html tokenizer v1

PCRE2 (PHP >=7.3)
tokenizes your html (very buggy)
Submitted by anonymous - 17 days ago
1

HTML PrimeNG (replace) empty opening and closing tags (into to self closed tags)

PCRE2 (PHP >=7.3)
This regular expresion matches opening and closing empty tags from PrimeNG library. This can be useful to replace it for self-closed tags which is available from Angular v15. Replacer: ``
Submitted by https://sergiorey23.github.io/ - 19 days ago (Last modified 18 days ago)
1

UUID v7 Matching

PCRE2 (PHP >=7.3)
UUID v7 Resources: https://uuid7.com/ https://uuid.ramsey.dev/en/stable/rfc4122/version7.html https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html#name-uuid-version-7 ...
Submitted by Regex by Ignacio del Corro / cxto21 - 21 days ago (Last modified 17 days ago)
1

Words that are only sequences of Chemical Element Symbols, allowing smushes

PCRE2 (PHP >=7.3)
This will match only words that include chemical elements: H + Og + W + Ar + Ts but not Eton. It allows internal overlap: LaG = La + Ag, and allows the first letter or last letter to be the end/start of a symbol to allow chaining. You can easily remove the various pieces, though. A single-line (non...
Submitted by mrflip - 22 days ago (Last modified 22 days ago)
123...901

Community Library Entry

1

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