通过对象匹配 Javascript regexp 中的空格，通过 RegExp 构造函数创建
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Match whitespace in Javascript regexp by object, created through RegExp constructor
提问by Andrew
Please, look into this code. Why does creating of the same regular expression by different ways (by /regex/literal and through RegExpconstructor) cause different result? Why doesn't the second pattern match the whitespace in the str?
请看一下这段代码。为什么通过不同的方式（通过/ regex/literal 和通过RegExp构造函数）创建相同的正则表达式会导致不同的结果？为什么第二个模式与str中的空格不匹配？
var str = " ";
var pat1 = /\s/;
document.writeln(pat1.test(str)); // shows "true"
var pat2 = new RegExp("\s");
document.writeln(pat2.test(str)); // shows "false"
Can't find the answer on my question anywhere. Thanks
无法在任何地方找到我的问题的答案。谢谢
回答by Sean Bright
You need to escape the backslash since it's in a string:
您需要转义反斜杠，因为它在字符串中：
var pat2 = new RegExp("\s");
