Title case angular filter

title-case.js

app.filter('titlecase', function () {
  return function (input) {
    var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;

    // cast the input to lower case to deal with weird all caps issue
    input = input.toLowerCase();
    
    return input.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function(match, index, title){
      if (index > 0 && index + match.length !== title.length &&
          match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
          (title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
          title.charAt(index - 1).search(/[^\s-]/) < 0) {
        return match.toLowerCase();
      }
      
      if (match.substr(1).search(/[A-Z]|\../) > -1) {
        return match;
      }
      
      return match.charAt(0).toUpperCase() + match.substr(1);
    });
  }
})