Regular Expressions 101

Community Patterns

21

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·2023-09-08 16:51
Updated·2023-09-08 16:54
Flavor·ECMAScript (JavaScript)

/
(?<FULLREQUEST>^(?<HOST>(?<PROTOCOL>(?:http)?s?:?\/\/)(?<DOMAIN>[^\/]+\/)|(?<RELATIVE>(?:\.*\/?)+))(?<PATH>[^\s]+\/)?(?<FILENAME>(?:(?<NAME>[^\/\s\.\?\#]+?)?(?<EXT>\.[^\s\?\#]*)?|(?:\/[^\/\s\?\#]+?)))(?<QUERYSTRING>\?[^\s\#]+)?(?<ANCHOR>\#\S+)?$)
/
gim
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Description

Need to FULLY Break Out EVERY Component of a URL?

Like, as in "every constituent element individually accessible in its own named capture group?" Need it to be pre-optimized and fully ECMA-compliant? Want to see exhaustive unit tests proving these claims (144 are included; all 144 execute in 6.5ms. Total.)?

Then you just lucked out.

What Does It Do?

Fully breaks down a URL, acting the same (meaning the same capture group names apply regardless of use case; makes for MUCH easier interaction in ones code) on:

  • Relative Paths (./, .//)
  • Absolute Paths (/)
  • Fully-qualified domains (https://www.domain.com/)
  • Partially-qualified domains (https://domain.com/)
  • Dynamically-protocol'd domains (//domain.com/)

...with each separated out into HOST, PROTOCOL, DOMAIN, and RELATIVE path prefix.

BUT WAIT! THERE'S MORE!

It then further proceeds to break out (also into individually-named groups, but only when present):

  • URI Path (/some/path/to/a/file/)
  • Full File Name, with or without Extension (filename.ext)
    • File Name (filename)
    • Extension (.ext)
  • QueryString Parameters (?query=string)
  • Anchor Tags/Routing (#SomeAnchor)

Best of all, EVERY ONE of these are delivered in named capture groups (so you're looking at obj.groups.DOMAIN instead of object[3])

Examples:

Fully-Qualified Domain

Full Request: https://www.domain.com/some/path/to/a/file-with.ext?Plus=QueryString#AndAnchor Host: https://www.domain.com/ Protocol: https:// Domain: www.domain.com/ Path: some/path/to/a/ FullFileName: file-with.ext FileName: file-with Extension: .ext QueryString: ?Plus=QueryString Anchor: #AndAnchor

Relative Path

Full Request: ../../../../some/path/to/a/file-with.ext?Plus=QueryString#AndAnchor Relative: ../../../../ Path: some/path/to/a/ FullFileName: file-with.ext FileName: file-with Extension: .ext QueryString: ?Plus=QueryString Anchor: #AndAnchor

Submitted by @JJ for Nerdy Deeds, LLC