Regular Expressions 101

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Community Patterns

18

Email validation

PCRE (PHP <7.3)
no description available
Submitted by tutsplus.com - 10 years ago
18

Date Regex(DD/MM/yyyy)

PCRE (PHP <7.3)
no description available
Submitted by alcaamado - 9 years ago
19

Email (RFC2822)

Recommended
ECMAScript (JavaScript)
Email address compliant with RFC2822
Submitted by Jago - 9 years ago
19

Between tags content

PCRE (PHP <7.3)
no description available
Submitted by Agustín Bouillet - 9 years ago
19

Get path from any text

Recommended
PCRE2 (PHP >=7.3)
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...
Submitted by nitrateag - 2 years ago (Last modified a year ago)
20

best youtube id match ( iframe embed replace ready )

Recommended
PCRE (PHP <7.3)
MATCH ANY YOUTUBE ID author : mi-ca v1.0 – 2017.03.08 This Regex match any youtube url and grab the ID. Embed ready √ --...
Submitted by mi-ca.ch - 6 years ago
22

UK Postcode Checker

PCRE (PHP <7.3)
Checks for valid UK/British postcodes. There was another on here that had for some reason been upvoted, but it was actually incorrect as it worked on none of my valid own postcodes! Namely that it assumed two letters and a number (BS3) when you can have variations (M20). Allows for an optional spac...
Submitted by MaffooBristol - 10 years ago
23

userName

PCRE (PHP <7.3)
1-15 alphanumeric login name
Submitted by gsanchezc - 9 years ago
25

Quote Macthing with escape

ECMAScript (JavaScript)
Matches text within quotes (", ') and escapes the charecters.
Submitted by Vihan Bhargava - 10 years ago
25

grab valid css rules and properties

ECMAScript (JavaScript)
no description available
Submitted by Pavel Dominguez - 9 years ago
26

match valid JSON

PCRE (PHP <7.3)
Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.
Submitted by Mateon1 - 10 years ago
27

Parsing browser User Agents

PCRE (PHP <7.3)
From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.
Submitted by OnlineCop - 10 years ago (Last modified a year ago)
29

Wrap long string to spec length

PCRE (PHP <7.3)
no description available
Submitted by fullpipe - 11 years ago
29

CSV line parsing

PCRE (PHP <7.3)
Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.
Submitted by Various - 10 years ago
30

Cron schedule

Recommended
PCRE (PHP <7.3)
Validate cron lines (even the ones commented out)
Submitted by anonymous - 8 years ago
31

Email address (most used)

ECMAScript (JavaScript)
Email address, most used cases
Submitted by Jago - 9 years ago
31

ninite

PCRE (PHP <7.3)
no description available
Submitted by peek - 9 years ago
34

Strict Password Validator

ECMAScript (JavaScript)
This regex matches only when all the following are true: password must contain 1 number (0-9) password must contain 1 uppercase letters password must contain 1 lowercase letters password must contain 1 non-alpha numeric number...
Submitted by qho - 7 years ago (Last modified a year ago)
35

http://

PCRE (PHP <7.3)
no description available
Submitted by Mitus M. - 11 years ago
35

Google like regex

ECMAScript (JavaScript)
Attempts to mimic Google search box behavior, returning an array with the separated search strings (that keep the +/- indicator for following operations)
Submitted by mettjus - 11 years ago
1...898899900901

Community Library Entry

19

Regular Expression
Recommended
PCRE2 (PHP >=7.3)

/
(?<opening>\b(?<montage>[a-zA-Z]:[\/\\])|[\/\\][\/\\](?<!http:\/\/)(?<!https:\/\/)(?>[?.][\/\\](?:[^\/\\<>:"|?\n\r ]+[\/\\])?(?&montage)?|(?!(?&montage)))|%\w+%[\/\\]?)(?:[^\/\\<>:"|?\n\r ,'][^\/\\<>:"|?\n\r]*(?<![ ,'])[\/\\])*(?:(?=[^\/\\<>:"'|?\n\r;, ])(?:(?:[^\/\\<>:"|?\n\r;, .](?: (?=[\w\-]))?(?:\*(?!= ))?(?!(?&montage)))+)?(?:\.\w+)*)|(?:'(?&opening)(?=.*'\W|.*'$)(?:[^\/\\<>:'"|?\n\r]+(?:'(?=\w))?[\/\\]?)*')|"(?&opening)(?=.*")(?:[^\/\\<>:"|?\n\r]+[\/\\]?)*"
/
g
Open regex in editor

Description

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]
  • [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 - 2 years ago (Last modified a year ago)