to-title-case.js

/* 
 * To Title Case 2.0.1 – http://individed.com/code/to-title-case/
 * Copyright © 2008–2012 David Gouch. Licensed under the MIT License. 
 */

String.prototype.toTitleCase = function () {
  var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|of|on|or|the|to|vs?\.?|via)$/i;

  return this.replace(/([^\W_]+[^\s-]*) */g, function (match, p1, index, title) {
    if (index > 0 && index + p1.length !== title.length &&
      p1.search(smallWords) > -1 && title.charAt(index - 2) !== ":" && 
      title.charAt(index - 1).search(/[^\s-]/) < 0) {
      return match.toLowerCase();
    }

    if (p1.substr(1).search(/[A-Z]|\../) > -1) {
      return match;
    }

    return match.charAt(0).toUpperCase() + match.substr(1);
  });
};

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