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

Removes empty HTML tags. Was needed for old input clean-up and to keep a HTML parses from crashing. Looking for improvement on bottom test.