Regular expression include and exclude special characters

Question

I\'m finding a regular expression which adheres below rules.

Allowed Characters

Alphabet : a-z / A-Z
Numbers : 0-9
Special Characters : ~ @ # $ ^ &

Answer 1

[a-zA-Z0-9~@#\^\$&\*\(\)-_\+=\[\]\{\}\|\\,\.\?\s]*

This would do the matching, if you only want to allow that just wrap it in ^$ or any other delimiters that you see appropriate, if you do this no specific disallow logic is needed.