Regular Expressions 101

Community Patterns

22

Get path from any text

Created·2023-01-31 14:38
Updated·2023-07-23 20:17
Flavor·PCRE2 (PHP)
Recommended·
Get path (windows style) from any type of text (error message, e-mail corps ...), quoted or not. THIS IS THE SINGLE LINE VERSION ! If you want understand how it work or edit it, go https://regex101.com/r/7o2fyy Relative path are not supported The goal is to catch what "Look like" a path. See the limitations UNC path and prefix path like //./], [//?/] or [//./UNC/] are allowed some url path like [file:///C:/] or [file://] are allowed Catch path quoted with ["] and [']. But these quotes are include with the catch Quoted path is not concerned by limitations Limitations : (only unquoted path) [dot] and [space] is allowed, but not in a row [dot+space] or [space+dot at end of file name isn't catched INSIDE A NAME FILE (or last directory if it is a path to a directory) : [comma] is not supported (it stop the catch) after a first [dot], any [space] stop the catch after a [space], catch is stoped if next character is not a [letter], [digit] or [-] so, double [space] stop the catch Compatibility compatible PCRE, PCRE2 AutoHotkey : don't forget to escape "%" in "`%" /!\ Powershell and .Net /!\\ : this regex need some modification to be interpreted by powershell. You have to replace each (?&CapturGroupName) by \k. Use this powershell code to do this replacement : ` $powershellRegex = @' [Put here the regex to replace (?&CapturGroupName) with \k] '@ -replace '\(\?&(\w+)\)', '\k' ` This example code must return : [Put here the regex to replace \k with \k]
Submitted by nitrateag

Community Library Entry

1

Regular Expression
Created·2015-03-27 22:03
Flavor·PCRE (Legacy)

`
(?(DEFINE) (?<PROTOCOL>[^:/#?\s]+://) (?<LOGIN>[^:@/#?\s]+(?::[^@/#?\s]+)?@) (?<TEXT_DOMAIN>[^./#?\s-:]+(?:-[^./#?\s-:]+)?\.) (?<IP_DOMAIN> (?&NOT_RESERVED_IP) (?: (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\. ){3} (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) ) (?<NOT_RESERVED_IP> (?!(?:1?0|224)(?:\.\d{1,3}){3}| (?:192\.168|172\.16)(?:\.\d{1,3}){2} ) ) (?<TLD>[^/#?\s.\d:-]+) (?<PORT>:\d{1,4}) (?<PATH>/(?:[^/\s&#?]*/?)+) (?<QUERY> \? (?: [^\s=]+(?:=[^&\s]*)? (?:&[^\s=]+(?:=[^&\s]*)?)* )? ) (?<HASH>\#.*) ) ^ (?&PROTOCOL) (?&LOGIN)? (?:(?&TEXT_DOMAIN)+(?&TLD)|(?&IP_DOMAIN)) (?&PORT)? (?&PATH)? (?&QUERY)? (?&HASH)? $
`
gmx
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Description

Someone on IRC posted the following site: https://mathiasbynens.be/demo/url-regex which challgenged me to write a decent regex to match valid URLs in that list. This regex works in both pcre and javascript (you'll have to replace the pcre-specific syntax to make it work in JS).

Don't actually use this though, validate your URLs in a sane manner instead.

Submitted by Firas Dib