Regular Expressions 101

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Community Patterns

-1

Check mysql Date

PCRE (PHP <7.3)
Valid format YYYY-MM-DD
Submitted by anonymous - 8 years ago
-1

Emoji

PCRE (PHP <7.3)
Find emoji's in strings.
Submitted by Nathaniel Blackburn - 8 years ago
-1

freeCodeCamp: Restrict Possible Usernames

PCRE (PHP <7.3)
Usernames are used everywhere on the internet. They are what give users a unique identity on their favorite sites. You need to check all the usernames in a database. Here are some simple rules that users have to follow when creating their username. 1) The only numbers in the username have to be at...
Submitted by anonymous - 7 years ago
-1

Passwords

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 7 years ago
-1

Website (scheme,host,port,path and query)

PCRE (PHP <7.3)
This is regex for website url matching scheme,host,port,path and query. I did it because in c#, class Uri does not understand urls without scheme and says that 'google.com' is invalid url.
Submitted by anonymous - 7 years ago
-1

Discord Emojis

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 7 years ago
-1

Accept Language Header parser

PCRE (PHP <7.3)
parses accept language http header groups: language code iso-693-1 without country specification preference quality value
Submitted by schunka - 7 years ago
-1

Format RMarkdown Tables

PCRE (PHP <7.3)
Pipe tables format for R Markdown
Submitted by anonymous - 7 years ago
-1

ISO 8601 date regex with check of number of day in a month

PCRE (PHP <7.3)
Regex for date in ISO 8601 format that also check the number of day in a month to be sure the date is valid
Submitted by anonymous - 7 years ago
-1

IP Address validator

ECMAScript (JavaScript)
Validates IPv4 IP Address
Submitted by krzysp, fty4 - 7 years ago
-1

balanced parenthesis match

ECMAScript (JavaScript)
break the code to first opening parenthesis and then closing use the groups individually not entirely . This is 40% correct online pattern but mixing it with first open then close groups in two different matches result in 100% success
Submitted by Muhammed - 7 years ago
-1

sorry guys - uploaded by fat fingers and can't delete

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 7 years ago
-1

Find linked files

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 7 years ago
-1

e-mail

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 7 years ago
-1

Email validation

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 7 years ago
-1

Phone numbers USA

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 7 years ago
-1

Extract brazilian DDD and phone number

PCRE (PHP <7.3)
Extract brazilian DDD and phone number
Submitted by Anderson Rodrigues - 7 years ago
-1

rlike-regex

PCRE (PHP <7.3)
vyhledani netisknutelnych znaku .rlike("[\\x00-\\x1F\\x7F]")
Submitted by anonymous - 7 years ago
-1

test

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 6 years ago
-1

Password check

PCRE (PHP <7.3)
12 characters minimum at least 1 capital letter at leat 1 minuscule letter at least 1 number at least 1 special character
Submitted by anonymous - 6 years ago
1...521522523524525...902

Community Library Entry

-2

Regular Expression
ECMAScript (JavaScript)

/
^(?!$)M{0,2}(?:M(?=CM(?:XC)?(?:IX)?$))?(?:C(?=M[^CD]*(?:XC)?[^CD]*$))?M?(?:C(?=D[^C]*(?:XC)?[^C]*$))?D?C{0,2}(?:C(?=XC(?:IX)?$))?(?:X(?=C[^X]*(?:IX)?[^X]*$)(?!.*L))?C?(?:X(?=L[^X]*(?:IX)?[^X]*$))?L?X{0,2}(?:X(?=IX$))?(?:I(?=[XV]$))?X?V?I{0,3}$
/
Open regex in editor

Description

This regex matches roman numbers from 1 (I) to 3999 (MMMCMXCIX)

Submitted by Nicolò Ribaudo - 9 years ago