Strings that only have a-z 1-9 _-.

[monkeytooth]

I'm trying to figure out the best way to determine and or find out if a string only has a-Z 0-9 - _ . in it and nothing else, but I dunno what would be the best route to go with that. Anyone have ideas?

[Garethp]

if(preg_match('~[^a-zA-Z0-9\-_.]~', $String))

{

//The string contains other characters

}

[monkeytooth]

hmm.. ok, will give that a shot right now. thank ya

[oni-kun]

Yes, You'd use a Regular Expression ( REGEX ) pattern to find if a string contains certain characters. You can perform one like so:

 

function CheckString($str) 
{
  if (preg_match('~[^a-zA-Z0-9\-_.]~', $str)) {
     echo "String is VALID;" //1
  } else { 
     echo "STRING CONTAINS INVALID CHARACTERS" //0
  }
}

$txt = "A-Z-0_2_3_4_5";
$txt2 = "0-F-*-@-K";
CheckString($txt);
CheckString($txt2);