A variety of BEM flavoured regex.

An invoice number always has 10 digits, starting with a '9' (e.g. '9400065741'). But a number should also be found if it contains white-spaces. These numbers should also be found: '9400065741' ' 94 00065741'...

(?=\w{5,})(?=\D*\d{2}$)

中文英文匹配规则

^(\/\/)(?![\ ])(\w)*

Checks that a password has a minimum of 6 characters, at least 1 uppercase letter, 1 lowercase letter, and 1 number with no spaces.

like xxx="something" in

Regex to recognize Vehicle License Plates in Portugal