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·2017-07-27 00:53
Updated·2023-10-11 15:14
Flavor·PCRE2 (PHP)

/
^[#].*\n*(*SKIP)(*F)| # Version 1 (substitution: '$1$2\n'): # Match 1-80 characters, backtracking as necessary until whitespace or # EOL is reached. If words > 80 characters (w/o whitespace) are found, # no wrapping is performed on that word. # [1353 steps] #(.{1,80})(?:\s|$)|(\S{81,})(?:\s|$) # Version 2 (substitution: '$1$2\n'): # Same as Version 1 but with a negative look-ahead at the front to skip # to the alternate branch sooner. # [773 steps] #(?!\S{81})(.{1,80})(?:\s|$)|(\S{81,})(?:\s|$) # Version 3 (substitution: '$1$2\n'): # Same as Version 1 but alternations swapped. # [749 steps] #(\S{81,})(?:\s|$)|(.{1,80})(?:\s|$) # Version 4 (substitution: '$1\n'): # Combine alternations into one group. # [712 steps] (\S{79,}|.{1,80})(?:\s|$)
/
gmx
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Description

Four examples of word wrapping at the 80 character mark, each one taking fewer steps than the last.

Comment and uncomment lines with # to see the difference between versions. Optimization discussions welcome!

Submitted by OnlineCop