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.

Date with this format YYYY-MM-DD and year start 20 or 21 like 2014

Tests the string if it does contain valid latitude and longitude parameters

]+)\s()\s(?:\/>|>(.)) - (with global) finds all tags in scope 1st group is tagname 2nd group is attributes 3rd group (if it exists) is value of the tag Apply pattern again on 3th group to find internal tags (recurse in the code to parse entire xml!) Apply pattern below on 2nd group to find all attributes: \s+(+)\s=\s"(*)" - (with global) finds attributes 1st group is attributename 2nd group is attributevalue

Matches any IPv4 address

Exclude part of a string in an include string.

This search for special character at first position in the string

matching words between square brachets tags include newline or carriage return

Matches HTML structure

gets a postgis tablename from a mapfile with the given layer name, may not work depending on your mapfile layout

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Find Telephone

Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found

This will remove all facebook urls from a HTML string

Match regular expressions substitutions, I personally use this to perform my validate if it is a substitution, then call re.sub() on it.

Gets all numbers in a string. This includes positive and negative numbers aswell as integers and floats. By: http://www.benlorantfy.com/

help please. i need regex,

By inserting this regex in a programming language to test it against Codeforces 1800A you'll solve the task

PHP serialize / unserialize __sleep __wakeup __serialize __unserialize

Parses MS SQL Server version returned from executing SELECT @@version

For string splitting / deconstructing

Matches the XML pages of the /quizzes routes for feedpager

An extremely complete regex, that... Accepts international phones and most of regional phone numbers; Accepts phone numbers with/without "+", with/without space or "-" in the middle of the phone, and more. Gets groups of all important data of the phone number (local code, country code and the phone number itself)

Full email validation with optional "." "-" "_"

-2.02^3(2+3.024)+3.14159-(45^23)/(19-4)

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In between 2 delimiters

a simple username pattern