I'm writing a code for limiting a string input and for that I'm using reg. ex. but I 
have a problem:

 $string = "emramile";
  if(!(preg_match("/.{2,20}/","$string"))) {
        print "error";
  else {
        print "OK";

I wrote this code but it's not working. I couldn't find what the problem is. I'll be 
glad if anybody help me.    

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