JavaScript正则表达式.

Question

我有一个函数可以纠正大写异常大写单词列表:

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);
});

现在我遇到的问题是大多数输入字符串平均包含0到3个这些单词.显然现在我正在做几十个(可能有几百个;那个数组有一种不可思议的趋势,随着时间的推移而增长)函数调用基本上什么都不做.

如何更快地制作这段代码并摆脱不必要的函数调用？

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UIViews依赖于键盘位置)某处绝对是我的错.我试图弄清楚当应用程序从后台再次启动时会发生什么,并且可以完成UIView更改的位置.

Answer 1

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每个单词.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.

结果比原始代码快.