Javascript正则表达式对象和美元符号 [英] Javascript Regex object and the dollar symbol

问题描述

在下面的代码中。我期待的是真的，但我却变得虚假了。我错过了什么？

In the code below. I expected true but i am getting false instead. What am I missing?

var text = "Sentence $confirmationlink$ fooo";     
alert(placeHolderExists(text,'confirmationlink'); // alerts false
function placeHolderExists(text,placeholdername) {  
  var pattern = new    RegExp('\$'+placeholdername+'\$');    
  return pattern.test(text);
}

推荐答案

在构建字符串时，RegExp表达式构建器中的\被视为转义字符，就像在实际的RegExp中一样。您需要转义两次，尝试：

The "\" in the RegExp expression builder is treated as an escape character when building the string, just as it is in the actual RegExp. You need to escape twice, try:

new RegExp('\\$'+placeholdername+'\\$');

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