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 - 17 hours ago (Last modified 17 hours 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 - 20 hours 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 - a day ago (Last modified a day ago)
1

Extract links from text

PCRE2 (PHP >=7.3)
Extract links from text simple as that.
Submitted by anonymous - 3 days ago
1

Telephone number validation

PCRE2 (PHP >=7.3)
This validates any mobile or landline phone number in the world.
Submitted by kdesilva - 4 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 - 6 days ago
1

CIMTS business situation

PCRE2 (PHP >=7.3)
just playing around
Submitted by Jeremiah - 7 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 - 10 days ago (Last modified 10 days ago)
1

simple email checker

PCRE2 (PHP >=7.3)
sees if it is a proper email or not
Submitted by anonymous - 10 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 - 13 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 - 16 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/ - 18 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 - 20 days ago (Last modified 16 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 - 21 days ago (Last modified 21 days ago)
123...901

Community Library Entry

1

Regular Expression
PCRE2 (PHP >=7.3)

/
^ # Uncomment to allow prefix continuation (second letter of a dangling match) # ([abcdefghiklmnoprstuvy\ ])? ( \ |(?: # Single-letter elements [BCFHIKNOPSUVWY] ) |(?: # Two-letter elements. (?:A[cglmrstu])|(?:B[aehikr])|(?:C[adeflmnorsu])|(?:D[bsy]) | (?:E[rsu])|(?:F[elmr])|(?:G[ade])|(?:H[efgos])|(?:I[nr]) | (?:K[r])|(?:L[airuv])|(?:M[cdgnot])|(?:N[abdehiop]) | (?:O[gs])|(?:P[abdmortu])|(?:R[abefghnu])|(?:S[bcegimnr]) | (?:T[abcehilms])|(?:X[e])|(?:Yb)|(?:Z[nr]) ) |(?: # Smushed trigrams. No need to go past trigrams because two twos make four (?:A(?:ga|gd|ge|la|lr|md|mg|mt|ra|re|rg|ta|te|tl|tm)) |(?:E(?:ra|re|rg)) |(?:G(?:ag|al|am|ar|at|er)) |(?:L(?:ag|al|am|ar|at|ra|re|rg)) |(?:M(?:ga|gd|ge|ta|te|tl|tm)) |(?:R(?:ag|al|am|ar|at|er|ga|gd|ge)) |(?:T(?:ag|al|am|ar|at|er|la|lr|md|mg|mt)) |(?:X(?:er)) |(?:Z(?:ra|re|rg)) ) # repeated any number of times )+ # Uncomment to allow last letter if it's a potential first letter of the next word # ([ADEGLMRTXZ]\ *)? $
/
gimx
Open regex in editor

Description

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-"extended") regex is at the bottom of the test string

Submitted by mrflip - 21 days ago (Last modified 21 days ago)