Regular Expressions 101

Order By

Sponsors
There are currently no sponsors. Become a sponsor today!

Community Patterns

-18

dd-mm-YYYY HH:mm:ss (year range 1000-2999)

PCRE (PHP <7.3)
Validate Gregorian calendar dates that contain 24-hour times. This will also correctly match the Feb 29 date when it falls on a valid leap year. Leap years occur every 4 years, with one exception: when a year is evenly divisible by 100 but not evenly divisible by 400, the year will not be a leap ye...
Submitted by Ka. - 11 years ago (Last modified a year ago)
-4

Date with this format YYYY-MM-DD and year start 20 or 21

PCRE (PHP <7.3)
Date with this format YYYY-MM-DD and year start 20 or 21 like 2014
Submitted by cisc0 - 11 years ago
-3

Date and Time

PCRE (PHP <7.3)
no description available
Submitted by anonymous - 11 years ago
-3

Latitude/longitude tester

PCRE (PHP <7.3)
Tests the string if it does contain valid latitude and longitude parameters
Submitted by Doro - 11 years ago
-3

british postcode check

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

British Postcode Check

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

regex help

PCRE (PHP <7.3)
help please. i need regex,
Submitted by James - 10 years ago
-3

Number

ECMAScript (JavaScript)
Gets all numbers in a string. This includes positive and negative numbers aswell as integers and floats. By: http://www.benlorantfy.com/
Submitted by Ben - 10 years ago
-3

Match substitutions

Python
Match regular expressions substitutions, I personally use this to perform my validate if it is a substitution, then call re.sub() on it.
Submitted by Zarthus - 10 years ago
-3

mama

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

Detect a numeric string

ECMAScript (JavaScript)
no description available
Submitted by Ankur Chauhan - 10 years ago
-3

Strict email validation

ECMAScript (JavaScript)
no description available
Submitted by anonymous - 10 years ago
-3

Select a HTML table and all its innerHTML

PCRE (PHP <7.3)
no description available
Submitted by @ixzy24 - 10 years ago
-3

remove facebook urls from html

ECMAScript (JavaScript)
This will remove all facebook urls from a HTML string
Submitted by Russell Miller - 9 years ago
-3

Match email addresses and get the mail provider as a group

PCRE (PHP <7.3)
no description available
Submitted by Ole - 9 years ago
-3

Matches percentage with any number of digits

Python
Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found
Submitted by sharkey - 9 years ago
-3

RegEX for account code starting with 000-

PCRE (PHP <7.3)
no description available
Submitted by Joe H - 9 years ago
-3

Telephone

PCRE (PHP <7.3)
Find Telephone
Submitted by Mr.Fail - 9 years ago
-3

FQDN Fully Qualified Domain Name

PCRE (PHP <7.3)
no description available
Submitted by Rafael Justo and Mauro Trajber - 9 years ago
-3

ipv4 - short version

PCRE (PHP <7.3)
no description available
Submitted by gromozeka - 9 years ago
123...899

Community Library Entry

-18

Regular Expression
PCRE (PHP <7.3)

/
^(?<day>0[1-9]|1\d|2[1-8]|29(?=-\d{2}-(?!1[26]00|2[048]00)\d{2}(?:[02468][048]|[13579][26]))|30(?!-02)|31(?=-0[13578]|-1[02]))-(?<month>0[1-9]|1[0-2])-(?<year>[12]\d{3}) (?<hour>[01]\d|2[0-3]):(?<minute>[0-5]\d):(?<second>[0-5]\d)$
/
gm
Open regex in editor

Description

Validate Gregorian calendar dates that contain 24-hour times.

This will also correctly match the Feb 29 date when it falls on a valid leap year.

  • Leap years occur every 4 years, with one exception: when a year is evenly divisible by 100 but not evenly divisible by 400, the year will not be a leap year.
  • Thus years 2100, 2200, and 2300 are not leap years but years 2000, 2400, and 2800 are.
Submitted by Ka. - 11 years ago (Last modified a year ago)