Uppercase & lowercase & symbol counter

StringUtils.js

var StringUtils = (function(){
  
  var doCount = function(value, regex){
      var i,count=0,len=value.length;
      for(i=0;i<len;i++) {
        if(regex.test(value.charAt(i))) {
          count++;
        }
      }
      return count;
  },
      
  countUpperCase = function(value){
    return doCount(value, /[A-Z]/);
  },
      
      
  countLowerCase = function(value){
    return doCount(value, /[a-z]/);
  },
  
  countDigits = function(value){
    return doCount(value, /[0-9]/);
  },  
      
  countSymbols = function(value){
    return doCount(value, /[`!"\$%\^&\*\(\)_\-\+={\[}\]:;@'~#\\\|\<,>\.\?\/]/);
  };  
      
  
  return {
      countUpperCase : countUpperCase,
      countLowerCase : countLowerCase,
      countSymbols : countSymbols,
      countDigits : countDigits
  };
}());


StringUtils.countSymbols("`!sdfg\"$%^&dgf*()_-dfgsdfg+={[}]:;@'~#|\<,>.?/");