How to match all alphabet except few?

Question

I want to match [a-z] only except the letters a,e,i,o,u

Using negated set [^aeiou]* I could match everything except a,e,

Answer 1

You could use negative lookahead assertion. It's like a kind of subtraction.

(?![aeiou])[a-z]
     ^        ^
     |        |
subtract    from

DEMO