My RFC 5322 implementation for email validation with few limitation on top level domain name

relative to absolute

Parsing html with regex is bad though.

supports all major protocols

Esta expresión regular permite detectar las variables que están declaradas dentro de una url o route del framework Flask, con esto lo único que queda es armar un loop que recorra las coincidencias y que las remplace por los valores adecuados

I need to match a pattern as follows with the added limitation that the match must be exactly 7 characters long: /^\d[a-zA-Z]\d$/ In words, this is a 7 character sequence of 6 digits and one alphabetic character in any order. How do I limit the overall length to 7 using regex? Thanks!

1.Tree of subdivisions may have up to 127 levels. 2.Each label may contain up to 63 characters. 3.The full domain name may not exceed the length of 253 characters in its textual representation. rfc1035 rfc1123 rfc2181

The special characters are ~!@#$%^&*()

Description here

username

Check for correctly formatted array of this type: array( array('name'=>'War and Peace', 'year'=>1865), array('name'=>'Different Seasons', 'year'=>1982), )

Check for correctly formatted array of this type: array('a', 'bb', 'ccccc',)

Check for correctly formatted array of this type: array(1,2,3,)