Question

我有以下代码：

searchSt =＆＃34;测试＆＃34;， searchEd =＆＃34;在＆＃34 ;;

var html = body.clone()
    .children()
    .remove()
    .end()
    .text();

alert(searchSt + "|" + searchEd);
var patt = searchSt + "(.*)" + searchEd;
var result = html.match(patt);
alert(result[0]); //returns null

虽然我确定这些词是存在的，但这会返回null： HTML：

Hello World
Test Write SomeThing here is Words do it. hit in me

有什么问题？

Answer 1

如果您使用的是JQuery，则代码应如下所示：

<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<body>
Hello World
Test Write SomeThing here is Words do it. hit in me 
</body>
</html>
<script type="text/javascript">
    var searchSt = "Test", searchEd = " in";
    var html = $('body').clone().children().remove().end().text();

            alert(searchSt+"|"+searchEd);
            var patt = searchSt+"(.*)"+searchEd;
            var result = html.match(patt);
            alert(result[0]);//returns null

</script>

确保脚本位于body标签下方。如果它高于身体标签，则无法找到。而且我也改变了如何获得身体$（'body'）的方式。

正则表达式没有问题

Answer 2

在RegExp构造函数中放置一个字符串正则表达式（如果需要，可以使用字符）：

var re = new RegExp(searchSt + "(.*)" + searchEd); // => /Test(.*)in/

倒杆：

var re = new RegExp("\\d"); // => /\d/

Answer 3

它看起来不像是一个正则表达式问题。可能还有别的东西。
在这里测试http://ideone.com/nNwz3

var html = "Hello World\
Test Write SomeThing here is Words do it. hit in me";

var searchSt = "Test", searchEd = " in";

var patt = searchSt+"(.*)"+searchEd;
var result = html.match(patt);

print ("'" + result[0] + "'");
print ("'" + result[1] + "'");

输出

'Test Write SomeThing here is Words do it. hit in'
' Write SomeThing here is Words do it. hit'

JS正则表达式不起作用

3 个答案: