Question

I need to build a regex (in PHP) that match if a string has at least one character different from a set provided. Here is my set:

A to Z and a to z, numbers, and áéíóúüÁÉÍÓÚÜ¡¿!?-:

So this word should not match: Sebastián
This match: Sebastiàn

I reprhased the question due to the comment of varchar256. BTW, when examples differ from verbose instructions, take the example as the true intention of the author of the doc.

Answer 1

preg_match('/[^A-Za-z0-9áéíóúüÁÉÍÓÚÜ¡¿!?\-:]/', ...);

Note the ^ inside the brackets – that inverts the match, so this regex will match on any strings which contains at least one character that is NOT listed inside the brackets.