Regular Expressions 101

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Regular Expressions 101

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482
pcre

regex101.com id grabber

grabs the ID for the regex101.com permalink to code
Submitted by chris mccoy - 9 years ago
234
pcre

Matching email addresses per RFC5322

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.
Submitted by Michael Musson - 9 years ago
51
pcre

Disorted Email Addresses

Matches distorted email addresses and converts them back to real ones.
Submitted by dislick - 10 years ago
40
pcre

URL regexp

A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.
Submitted by Matthew O'Riordan - 10 years ago
37
pcre

http://

no description available
Submitted by Mitus M. - 9 years ago
32
pcre

ninite

no description available
Submitted by peek - 7 years ago
28
pcre

Wrap long string to spec length

no description available
Submitted by fullpipe - 10 years ago
28
pcre

CSV line parsing

Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.
Submitted by Various - 8 years ago
26
pcre

match valid JSON

Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.
Submitted by Mateon1 - 8 years ago
23
pcre

userName

1-15 alphanumeric login name
Submitted by gsanchezc - 8 years ago
22
pcre

UK Postcode Checker

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 - 8 years ago
18
pcre

Parsing browser User Agents

From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.
Submitted by OnlineCop - 8 years ago
18
pcre

Date Regex(DD/MM/yyyy)

no description available
Submitted by alcaamado - 8 years ago
17
pcre

Date: DD-MM-YYYY hh:mm:ss

Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug
Submitted by Ka. - 10 years ago
17
pcre

Email validation

no description available
Submitted by tutsplus.com - 9 years ago
17
pcre

Capture comma separated numbers

Capture comma separated numbers, no matter if there are spaces before or after the commas.
Submitted by Fernando Nunes - 8 years ago
17
pcre

Between tags content

no description available
Submitted by Agustín Bouillet - 7 years ago
16
pcre

Alphanumeric Regex

no description available
Submitted by Deepan - 8 years ago
16
pcre

IPv4

no description available
Submitted by robwa - 7 years ago
16
pcre

Cron schedule

Validate cron lines (even the ones commented out)
Submitted by anonymous - 7 years ago
1234...463

Hostname validator

Vote

-1

Regular Expression
pcre

/
^(?: (?:[\pL\pN\pS-\.])+(?:\.?(?:[\pL]|xn\-\-[\pL\pN-]+)+) # a domain name | # or \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} # a IP address | # or \[ (?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::)))) \] # a IPv6 address )$
/
ixu
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Description

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Submitted by anonymous - 7 years ago