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·2023-08-03 15:29
Updated·2023-08-03 15:31
Flavor·PCRE2 (PHP)

/
^(?!.*\.\.)([-!#-'*+\/-9=?A-Z^-~]+(\.[-!#-'*+\/-9=?A-Z^-~]+)*|"([]!#-[^-~ \t]|(\\[\t -~]))+")@([0-9A-Za-z]([0-9A-Za-z-]{0,61}[0-9A-Za-z])?(\.[0-9A-Za-z]([0-9A-Za-z-]{0,61}[0-9A-Za-z])?)*|\[((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3}|IPv6:((((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){6}|::((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){5}|[0-9A-Fa-f]{0,4}::((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){4}|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):)?(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){3}|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){0,2}(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){2}|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){0,3}(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){0,4}(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::)((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3})|(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3})|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){0,5}(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3})|(((0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}):){0,6}(0|[1-9A-Fa-f][0-9A-Fa-f]{0,3}))?::)|(?!IPv6:)[0-9A-Za-z-]*[0-9A-Za-z]:[!-Z^-~]+)])$
/
gm
Open regex in editor

Description

This is written using several other developer's work with my tying it all together and adding a few small requirement of my own.

allows Latin characters (“a” - “z” or “A” - “Z”) within the email address. permits digits (0 - 9) in the email address. enforces domain part restrictions. allows hyphens (-) inside the domain as long as they don’t lead or trail the domain. allows IP address literals surrounded with square brackets ([]) for the domain names. restricts sub-domains to a maximum length of 63 characters. applies local part restrictions. permits the set of special characters allowed by RFC 5322 (“!”, “#”, “$”, “%”, “&”, “’”, “*”, “+”, “-”, “/”, “=”, “?”, “^”, “_”, “`”, “{”, “|”, “}”, “~”) to reside in the local part. lets local part comprise as double quotes housing one or more sequences of ASCII characters. doesn’t allow trailing, leading, or consecutive periods anywhere within the email address. doesn’t allow spaces anywhere in the address

Submitted by anonymous