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

15

Regular Expression
Created·2019-03-17 21:49
Updated·2023-07-27 21:03
Flavor·ECMAScript (JavaScript)

/
^((?!\.)[\w\-_.]*[^.])(@\w+)(\.\w+(\.\w+)?[^.\W])$
/
gm
Open regex in editor

Description

RegEx email

/^((?!\.)[\w-_.]*[^.])(@\w+)(\.\w+(\.\w+)?[^.\W])$/gim;

Just playing with Reg Ex. This to validate emails in following ways

  • The email couldn't start or finish with a dot
  • The email shouldn't contain spaces into the string
  • The email shouldn't contain special chars (<:, *,ecc)
  • The email could contain dots in the middle of mail address before the @
  • The email could contain a double doman ( '.de.org' or similar rarity)

Groups

There was created 3 groups into this validations that could be used for custom purposes or replacements

mailname@domain.com

  • First group takes the first string with the name of email $1 => (mailname)
  • Second group takes the @ plus the domain: $2 => (@domain)
  • Third group takes the last part after the domain : $3 => (.com)
Submitted by https://www.linkedin.com/in/peralta-steve-atileon/