A regex for the brazilian document named of CNPJ (Cadastro Nacional de Pessoa Jurídica)

This is a input regex for invaliding inputs that are likely to be scripts. this is a way to hidder xss attacks on your web application and api.

regex that identifies music notes written with A, B, ..., A#, C#, ... Ab, Bb, ... notation.

use part 6

match bot commands in the first at starting of line only egs - /hi

matching any SQL query starting by "SELECT foo,bar FROM fool,baz {...}" this one is the good one. first one have a matching alowing * in the FROM statement.

look for a word of 4 letter with the look behind and look ahead

This expression is used to parse strings like category.slug==smartphone&&request.user_id==12

mail

select leading X digits, remove zero if present, and insert 6 or 7 digit length into a name group