Regular Expressions 101

Community Patterns

23

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·2022-11-23 13:23
Flavor·.NET 7.0 (C#)

@"
^ *([\+\-]?) *(?>([0-9]+)[.,]?([0-9]*)|[.,]?([0-9]+)) *%? *$
"
Open regex in editor

Description

Turn "123,456 %" into just "123.456"!

Mainly for use in C# to parse percentage as string into double.

  • Strip away whitespace
  • Replace comma with decimal point
  • Only allow valid numeric input
    • multiple commas or decimal points won't match
      • therefore does not support thousands-grouping, not even spaces, sorry
    • multiple % symbols won't match
    • any character not 0-9, ,, . or % won't match
    • + or - will match, but +- or ± will not, nor will any other operators
  • Using $1$2.$3$4 for substitution spits out a sanitized number with a forced decimal point.

Note: The decimal point is present even when the number input doesn't include any decimals, e.g. for 12% the result will be 12.. You may wish to append a 0 in your code to make it 12.0 - in .NET 4.5 C# the double.Parse and double.TryParse handle the result just fine even without that, but your mileage may vary.

See example on repl.it

Submitted by Moravuscz