Regular Expressions 101

Order By

Filter by Flavor

Community Patterns

Search among community submitted regex patterns...

0/512

Community Library Entry

Regular Expression
Created·2023-01-31 14:39
Updated·2023-05-04 12:23
Flavor·PCRE2 (PHP)

(?############ Let's catch paths without "" or '' ############################ )(?<opening>(?# First, catch the starting path, the <opening> ################### )\b(?<montage>[a-zA-Z]:[\/\\])(?# montage = 'C:/' )|[\/\\][\/\\](?<!http:\/\/)(?<!https:\/\/)(?>(?# check not 'http[s]:' prefix )[?.][\/\\](?:[^\/\\<>:"|?\n\r ]+[\/\\])?(?# '//[?or.]/xxxxx' or '//[?or.]/server/' )(?&montage)?(?# '//[?or.]/c:/' or '//[?or.]/server/c:/' )|(?!(?&montage)))(?# '//[addressIP/ or serverName/ but not C:/]' )|%\w+%[\/\\]?(?# '%EnvVariable%[/]' ))(?# So, <opening> catch : 'C:/' or '//[?or.]/[UNC/]C:/' or '//[?or.]/[UNC/]' or '//[next characters must be something other than C:/]' or '%EnvironementVariable%[/]' )(?:(?# now, we catch each directory name wich is between [/] ######################## )[^\/\\<>:"|?\n\r ,'](?# the first character should not be [ ,'] )[^\/\\<>:"|?\n\r]*(?# Any pathFrendly character )(?<![ ,'])(?# The last directory name's character must not be [ ,'] )[\/\\](?# End of directory name - who are between '/' - ))*(?# Catch most 'directoryName/' as possible )(?:(?# Lets catch the End path. There is a file ? a directory ? or just a useless '/' ? )(?=[^\/\\<>:"'|?\n\r;, ])(?#if next character is not pathFriendly or ' ' or [,'], we have reach the end of the path => we don't catch the last '/' and the the Regex end now. You can't catch fileName who begin by [,'] because they are probably a delimiter between 2 path. but '.' is allowed )(?:(?#If we are here, that mean there is a fileName or directoryName to catch ###### We will catch the last directoryName or the fileName without the extention ###### )(?:[^\/\\<>:"|?\n\r;, .](?# catch any character pathFriendly exept ' ' or [,.] )(?: (?=[\w\-]))?(?# If we find a ' ', we catch him if next charcter is not a delimiter. I see '-' after an ' ' not like a delimiter. )(?:\*(?!= ))?(?# If we find a '*', we stop the catch if next character is an ' ' )(?!(?&montage))(?# If we find a string who look like 'C:/', we stop the catch ))+(?# We catch theses word delimited by ' ' as much as possible ))?(?# it's possible the fileName have no name, but just an extention )(?:\.\w+(?# #### an extention begin by '.' and at least one none delimiter chracter ))*(?# we can add more extention until the first none '.' delimiter character. So, after the first '.' character inside a fileName, we cannot catch any ' ' character If we don't find one extention, so the filename is a directory name, and we stop the catch. ))(?# ############# END OF PATH CATCHING WITHOUT QUOTE "" and '' ####################### )|(?:(?# ######### Catching path quoted '' ########################### Path quoted '' is difficult because ['] is also a pathFrendly character )'(?&opening)(?# We catch .* between quote only if string start with an <opening> )(?=.*'\W|.*'$)(?# We catch .* between quote only if we are sure we will find end quote. End quote must be ['] and delimiter character or ['] and end string )(?:[^\/\\<>:'"|?\n\r]+(?# We take any pathFriendly character exept quote ['] )(?:'(?=\w))?(?# we catch quote ['] if next character is not a delimiter )[\/\\]?)*(?# Path quoted must respect this patern until end quote character ['] )')(?# end quoted '' path )|(?# ######### Catching path quoted "" ########################### )"(?&opening)(?# We catch .* between quote only if string start with an <opening> )(?=.*")(?# We catch .* between quote only if we are sure we will find end quote ["] )(?:[^\/\\<>:"|?\n\r]+(?# We take any pathFriendly character )[\/\\]?(?# pathFriendly characters can be is delimited by '\' ))*(?# Path quoted must respect this patern until end quote character )"(?# end quoted path )

Open regex in editor

Description

Get path (windows style) from any type of text (error message, e-mail corps ...), quoted or not.

THIS IS COMMENTED VERSION ! to simple copy and use it, go https://regex101.com/r/zWGLMP

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]
[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<CapturGroupName>. Use this powershell code to do this replacement : $powershellRegex = @' [Put here the regex to replace (?&CapturGroupName) with \k<CapturGroupName>] '@ -replace '$\?&(\w+)$', '\k<$1>' This example code must return : [Put here the regex to replace \k<CapturGroupName> with \k<CapturGroupName>]

Submitted by nitrateag

Order By

Filter by Flavor

Community Patterns

RegEx for matching PDF files in browser

Remove .html from url

parse data URL

URL Validation

Youtube Video Id

Valid HTTP url

strip host port

Telegram messages url

URL Pattern Django

check url

URL

Check if is a roblox game

Find Secrets in Object

match the id of linkedin url

URL 2

Parse Roco url for information

determine if input text is an URL

URL filter out of a shell script file, inc URLs with ";"

Search for URL

Test with Regex

LinkedIn reaction URL

Photos18 Url Matcher

Javascript HTTP URL Validation

Strict URL Validation - 2

Removing port number from URL

Valid Link/URL for Event Callbacks

Strict URL validation

Extract any http https and any url form

Get path from any text

Capture optional HTML tag attributes in any order

Storyblok Img2

Extract domain and URI from an URL (no auth support)

https://github.com/AriesTriputranto9/datasets.git

Odysee video URL

Markdown Images (alt text, link, description)

YouTube extract videoId

Cloudfront URL pointing to S3

Checking if it's an hubspot url

Twitter profile url regexp

URL SERVER

AppStore apps URL

Match filenames in URLS (updated)

Matches filenames in urls

aff url normalize

Find encoded "&" and extract parts

MSSQL data source and initial catalog

audiomack

Match URL (any beginning and domain extension)

URL

Client URL Isolation