JavaScript 正则表达式性能。

我有一个函数可以纠正一系列异常大写单词的大小写：

var line = "some long string of text";
["AppleScript", "Bluetooth", "DivX", "FireWire", "GarageBand", 
 "iPhone", "iTunes", "iWeb", "iWork", "JavaScript", "jQuery", "MacBook", 
 "MySQL", "PowerBook", "PowerPoint", "QuickTime", "TextEdit", "TextMate",
 // ... 
 "Wi-Fi", "Xcode", "Xserve", "XMLHttpRequest"].forEach(function(name) {
      line = line.replace(RegExp(name, "gi"), name);
});

现在我面临的问题是大多数输入字符串平均包含 0 到 3 个这样的单词。显然，现在我正在执行数十次（可能是数百次；该数组具有随着时间的推移而增长的不可思议的趋势）函数调用，这些函数调用基本上什么也不做。

如何使这段代码更快并消除不必要的函数调用？

输入示例：

我的 iPhone 应用程序在 UIViewController 下有一个用户表单。当我再次启动应用程序时，我的一些 UIView 会更改其位置和大小。 （这些 UIView 取决于键盘位置）肯定是我的错。我尝试弄清楚当应用程序从后台再次启动时发生了什么以及 UIView 可以在哪里进行更改。

您可以构建包含所有单词的正则表达式，通过将每个单词括在括号中来捕获它。在替换中使用它将提供足够的信息来恢复替换函数中的原始单词。

  function correct (text, words) {
    return text.replace (RegExp ('\\b(?:(' + words.join (')|(') + '))\\b', 'ig'), function (m) {
      for (var a = arguments.length - 2; a--;)
        if (arguments[a])
      return words[a-1] || m;
    });
  } 

  console.log (correct ("My iphone itunes divx firewire application has a user form under uiviewcontroller. When I start application again some of my uiview changes its positions and sizes. (These uiviews depend on keyboard position) Somewhere is definitely my fault. I try to figure what is going on when application starts again from background and where the uiview changes can be done.",
    ["AppleScript", "Bluetooth", "DivX", "FireWire", "GarageBand", 
 "iPhone", "iTunes", "iWeb", "iWork", "JavaScript", "jQuery", "MacBook", 
 "MySQL", "PowerBook", "PowerPoint", "QuickTime", "TextEdit", "TextMate",
 // ... 
 "UIViewController","UIView",
 "Wi-Fi", "Xcode", "Xserve", "XMLHttpRequest"]));
My iPhone iTunes DivX FireWire application has a user form under UIViewController. When I start application again some of my UIView changes its positions and sizes. (These UIViews depend on keyboard position) Somewhere is definitely my fault. I try to figure what is going on when application starts again from background and where the UIView changes can be done.

事实证明这比原始代码更快 http://jsperf.com/regex-matching.