简单的正则表达式匹配一些字符并排除其他字符

Question

I need a regex for preg_match to accept all alphanumeric characters except l, L, v, V, 0, 2.

I've tried

^[a-zA-Z0-9][^lLvV02]*$

It works good excluding lLvV02 but it also accept other characters like SPACE,ù,@,#, etc...

How should I change it?

Answer 1

You may use

^(?:(?![lLvV02])[a-zA-Z0-9])*$

Details

• ^ - start of string
• (?: - start of a non-capturing group
  • (?![lLvV02])[a-zA-Z0-9] - an alnum char that is not one of the chars inside the character class residing inside a negative lookahead
• )* - end of the non-capturing group, 0 or more repetitions
• $ - end of string

See the Regulex graph: