Question

我从ajax GET请求获得以下响应（使用$ .Ajax ）

<div class="clienthoverpage_content">
    <div class="school_info" id="lesson_51123">
        <div class="_desc_content" id="lesson_content">
            <div class="_desc_icon">
            </div>
            <div class="_desc_description">
                <h1 class="hover_name" id="lesson_name"></h1>
                <div class="fraud_warning" id="lesson_fraud_warnings"></div>
                <div class="_desc_class_info" id="lesson_class_info">
                    <div id="lesson_class_name" class="ellipsis"></div>
                    <div id="lesson_type" class=""></div>
                </div>
                <div class="_desc_descriptors" id="lesson_descriptors">
                </div>
                                                    </div>
        </div>
    </div>
</div>
<script type="text/javascript">

    fnInitDisplay = function() {
        UserYou.LoadContexts( g_rgAppContextData );
        BuildHover( 'lesson_51123',  {"id":"123441","class":"51112","student":"506854340"} );
        $('lesson_51123').show();
    }

</script>

我感兴趣的一行是

BuildHover（＆＃39; lesson_51123＆＃39;，的 {＆＃34; ID＆＃34;：＆＃34; 123441＆＃34;＆＃34;类＆＃34;：＆＃34; 51112＆＃34;＆＃34;学生＆＃34;：＆＃34; 506854340＆＃34;} ）;

我想采用 id ，类，学生的值。我假设这样做的最佳方式是使用正则表达式，但我找不到合适的正则表达式。

Answer 1

我在Regex上的表现并不是很好，所以我会举例说明我只使用indexOf和substring方法。 JS-FIDDLE

var str = 'UserYou.LoadContexts( g_rgAppContextData );'+
'BuildHover( "lesson_51123",  {"id":"123441","class":"51112","student":"506854340"} );'+
    '$("lesson_51123").show();';

var _id = '"id":"';
var _class = '","class":"';
var _student = '","student":"';

var classIndex = str.indexOf(_class);
var idIndex = str.indexOf(_id);
var studentIndex = str.indexOf(_student);
var endStr = str.indexOf('"}');

var resultID = str.substr(idIndex + _id.length, classIndex - (idIndex + _id.length) );
var resultClass = str.substr(classIndex + _class.length, studentIndex - (classIndex + _class.length));
var resultStudent = str.substr(studentIndex + _student.length, str.length-2 - (studentIndex + _student.length));

Answer 2

var a = str.match(/BuildHover\(\s*'.*?',\s*(.*?)\s*\)/);
// Note a[1] will be a string use JSON.parse(a[1]) to get an object
console.log(a[1]); // {"id":"123441","class":"51112","student":"506854340"}

故障：

/ # start regex
  BuildHover\( # "BuildHover("
  \s* # 0 or more spaces
  ' # single quote ("'")
  .*?  # everything non gready
  ', # Match "',"
  \s* # 0 or more spacres
  ( # start capture group
    .*? # everything non gready
  ) # end group
  \s* # 0 or more spaces
  \) # ")"
/ # end regex

Answer 3

n=input("Enter a list:")
n.sort()
l=len(n)
n.remove(n[l-1])
l=len(n)
print n[l-1]

您可以在结果中找到String，然后使用JSON.parse获取对象。尽管做那些事情并不是很干净。

在JavaScript中通过regex查找字符串

3 个答案: