AngularJS directive - strip special characters

gistfile1.js

angular.module('ng', []).directive('removeSpecials', function(){
  return {
    require: 'ngModel',
    link: function(scope, element, attrs, modelCtrl){
      var clearString = function(inputValue){
        if(inputValue && inputValue.length){
          var cleanString = inputValue
            .replace(/(^\s+)|(\s+$)/g, '')
            .replace(/[\d\-\.\/\\\[\]\,\_\*\|\;\:\'\~\^\´\`\¨\%$$\@\!\(\)\=\+\#\¹\²\³\£\¢\¬\&<\>\°\º\ª\?]/g, '')
            .replace(/\s+/g, ' ')
            .replace(/ç/gi, 'C')
            .replace(/[ãáàâä]/gi, 'a')
            .replace(/[éèêë]/gi, 'e')
            .replace(/[íìïî]/gi, 'i')
            .replace(/[óòõôö]/gi, 'o')
            .replace(/[úùüû]/gi, 'u');

          if(cleanString !== inputValue){
            modelCtrl.$setViewValue(cleanString);
            modelCtrl.$render();
          }
          return cleanString;
        }
      };
      modelCtrl.$parsers.push(clearString);
      clearString(scope[attrs.ngModel]);
    }
  };
})