Regular Expressions 101

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Community Patterns

2

Replace \n by <br />

ECMAScript (JavaScript)
Replace non-ending string \n by the HTML tag
Submitted by anonymous - 11 years ago
7

split URL into location-resource-params (JavaScript)

ECMAScript (JavaScript)
Extract resource location, name and query parameters from a URL (JavaScript version)
Submitted by cebence - 11 years ago
4

Credit Card Number

PCRE (PHP <7.3)
Validates Credit Card Numbers of different type. Supports Visa, MasterCard, American Express, Diners Club, Discover and JCB Taken from http://www.regular-expressions.info/creditcard.html If you want to support only a particular type, customise it based on following....
Submitted by Ehsan - 10 years ago
11

find all link(<a>) tags expect your links in href attribute

ECMAScript (JavaScript)
YourLink - not found AnotherLink - found
Submitted by KoT - 9 years ago
8

Alphanumeric and Spaces

PCRE (PHP <7.3)
Alow alphanumeric characters and spaces
Submitted by JTN - 9 years ago (Last modified a year ago)
12

Full url parse, domain, path, params

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 9 years ago
14

RFC3339 DateTime

Recommended
PCRE (PHP <7.3)
Validates a RFC3339 DateTime format. Does not validates the Data
Submitted by anonymous - 9 years ago
6

reg Ex number range check

PCRE (PHP <7.3)
Hi, I am trying to get a reg ex that will test a number range and also allow european number convention like , for decimal point. I have this one for range check - ^(4-9{3}|1-9{4,5}|12{6}|30-4{5}|3500000)$ and I have this one for allow comma ^\s?([\d\.]+(\,\d{1,2})?|\,\d{1,2})\s$ but I need a comb...
Submitted by TimJ - 11 years ago
11

Codice fiscale

PCRE (PHP <7.3)
Check "codice fiscale"
Submitted by Luca - 9 years ago
4

Strip multi-line (star) comments from JavaScript, while leaving any CDATA sections intact.

PCRE (PHP <7.3)
This regular expression removes multi-line (star) comments from JavaScript, while leaving any CDATA sections intact. Use the global (g) modifier to match them all (if you plan to use PHP's preg_replace, the g modifier is not necessary), and use the (s) modifier to make dots match newlines (this will...
Submitted by Dane MacMillan - 12 years ago
9

Removing an XML Nodes namespace prefix from a XML string wit

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 11 years ago
10

Just validate one sequence of

PCRE (PHP <7.3)
sdfs sdfs FLBREV00022230 dsfsdfs sdfsf FLBREV00022234 In this case is false
Submitted by Fiipe - 10 years ago
11

remove comments from php code

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 10 years ago
3

split sentence regex

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 9 years ago
10

Valid Telephone Number

ECMAScript (JavaScript)
This regex validates varying types of telephone numbers.
Submitted by Adam Recvlohe - 9 years ago
4

Prime number regex

PCRE (PHP <7.3)
no description available
Submitted by originally "Abigail", comp.lang.perl.misc - 11 years ago
4

Get stuff inside <a> tags

PCRE (PHP <7.3)
Get stuff inside tags, which are between certain words
Submitted by Jerry - 11 years ago
7

PAN CARD validation

PCRE (PHP <7.3)
checks for valid PAN card for Indian users.
Submitted by karan thakkar - 11 years ago
1

Regular expression to remove all puncutation

Python
Removes all of the puncutation present inlcuding \n,\t,\r
Submitted by Abhinav Gupta - 10 years ago
12

Find Reddit Threads

Python
Simply searches for the thread-id in any kind of valid reddit-URL.
Submitted by Mio - 10 years ago
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Community Library Entry

1

Regular Expression
PCRE2 (PHP >=7.3)

/
^[a-zA-Z0-9]{3,8}-\d{1}$
/
gm
Open regex in editor

Description

Pattern to identify LOINC codes, derived from the description in LOINC.org (June 2024):-

LOINC codes have a fixed length field of 7 characters within the LOINC database. Current codes are from 3-7 characters long. If you are currently building a system to include LOINC codes, we advise allowing up to 10 characters (or at least 8 characters) to allow for further expansion. When the LOINC database contains 100,000 different LOINC records, the fixed length field will need to expand to 8 characters. The last digit of the LOINC code is a check digit and is always preceded by a hyphen (dash). The hyphen, as well as all the numbers, is part of the LOINC and must be included. The check digit is always a number form 0-9 and serves to help avoid errors in transcription of the code. Current licensing agreement for use of LOINC codes requires you to send the complete LOINC code.

Submitted by Richard Baxter - 6 months ago