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

0

Regular Expression
Created·2021-11-26 01:26
Updated·2021-12-16 16:46
Flavor·JavaScript

/
^(?<Name>(?<=^)(?:(?<Domain>(?:(?:localhost|[\w-]+(?:\.[\w-]+)+)(?::\d+)?)|[\w]+:\d+)\/)?\/?(?<Namespace>(?:(?:[a-z0-9]+(?:(?:[._]|__|[-]*)[a-z0-9]+)*)\/)*)(?<Repo>[a-z0-9-]+))[:@]?(?<Reference>(?<=:)(?<Tag>[\w][\w.-]{0,127})|(?<=@)(?<Digest>[A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][0-9A-Fa-f]{32,}))?
/
gm
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Description

This ES2018+ Javascript RegExp expression should parse the components of any valid Docker image reference URI.

It captures:

  • Name
    • ?Host
      • ?Domain
      • ?Port
    • ?Namespace
    • Repo
  • ?Reference
    • ?Tag
    • ?Digest

This expression uses named capture groups and lookarounds, which are available from ES2018. Be sure to check compatibility! See here for a good reference: https://www.smashingmagazine.com/2019/02/regexp-features-regular-expressions/#compatibility-table

The expression itself is based on a literal transcription of the RegEx from the official Go implementation / spec: https://pkg.go.dev/github.com/docker/distribution/reference

There is one notable deviation here from the spec -- I have separated the 'Path' component into two parts -- 'Namespace' and 'Repo'. This is helpful for registries which have container paths more than two levels deep (e.g. GitLab's.) So, in the case of registry.xyz/myorg/mygroup/myproject:latest, it would extract myorg/mygroup as "namespace" and myproject as "repo".

Hope this is helpful for someone!

Submitted by https://github.com/Propolisa