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...

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.

Pipe tables format for R Markdown

Regex for date in ISO 8601 format that also check the number of day in a month to be sure the date is valid

Extract brazilian DDD and phone number

vyhledani netisknutelnych znaku .rlike("[\\x00-\\x1F\\x7F]")

12 characters minimum at least 1 capital letter at leat 1 minuscule letter at least 1 number at least 1 special character

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 ...

PHP serialize / unserialize __sleep __wakeup __serialize __unserialize

http://stackoverflow.com/a/171499/1519058