I have a character set {x, y, z} and I want to check if some string contains at least one character from this set. 
For example:
abxyz - valid
zabc1 - valid
abc4e - not valid
I have a character set {x, y, z} and I want to check if some string contains at least one character from this set. 
For example:
abxyz - valid
zabc1 - valid
abc4e - not valid
 
    
     
    
    /.*[xyz].*/ should do the trick
