Regular Expressions 101

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Community Patterns

14

Email regex validation

ECMAScript (JavaScript)
RegEx email /^((?!\.)[\w-_.]*)(@\w+)(\.\w+(\.\w+)?)$/gim; Just playing with Reg Ex. This to validate emails in following ways ...
Submitted by https://www.linkedin.com/in/peralta-steve-atileon/ - 6 years ago (Last modified a year ago)
15

Hashtag

ECMAScript (JavaScript)
The secret of the Twitterverse.
Submitted by Joogl - 10 years ago
15

IPv4

PCRE (PHP <7.3)
no description available
Submitted by robwa - 9 years ago
16

Password

ECMAScript (JavaScript)
Safe Password that allow only with a number, a lowercase, a uppercase, and a special character
Submitted by davidlondono - 9 years ago
16

Alphanumeric Regex

PCRE (PHP <7.3)
no description available
Submitted by Deepan - 9 years ago
16

http url regex

ECMAScript (JavaScript)
general purpose HTTP URL regex
Submitted by Miguel Castillo @manchagnu - 9 years ago
17

Capture comma separated numbers

PCRE (PHP <7.3)
Capture comma separated numbers, no matter if there are spaces before or after the commas.
Submitted by Fernando Nunes - 9 years ago
18

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

Recommended
PCRE (PHP <7.3)
Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug
Submitted by Ka. - 11 years ago
18

Email validation

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

Email (RFC2822)

Recommended
ECMAScript (JavaScript)
Email address compliant with RFC2822
Submitted by Jago - 9 years ago
18

Date Regex(DD/MM/yyyy)

PCRE (PHP <7.3)
no description available
Submitted by alcaamado - 9 years ago
18

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
18

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)
19

Between tags content

PCRE (PHP <7.3)
no description available
Submitted by Agustín Bouillet - 9 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
24

grab valid css rules and properties

ECMAScript (JavaScript)
no description available
Submitted by Pavel Dominguez - 9 years ago
25

Quote Macthing with escape

ECMAScript (JavaScript)
Matches text within quotes (", ') and escapes the charecters.
Submitted by Vihan Bhargava - 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)
1...896897898899

Community Library Entry

2

Regular Expression
PCRE2 (PHP >=7.3)

/
\bword\b
/
gm
Open regex in editor

Description

Check if a string contains the word word in it (case insensitive). If you have no idea, I guess you could try /word/.

Submitted by anonymous - 10 days ago