javascript 使用RegExp动态创建正则表达式，过滤内容
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Using RegExp to dynamically create a Regular Expression, and filter content
提问by Mild Fuzz
I am struggling with using the RegExpobject to allow me to dynamically create an expression, and apply it to a group of elements.
我正在努力使用RegExp对象来允许我动态创建表达式，并将其应用于一组元素。
Here is a jsFiddle, below is the code:
这是一个 jsFiddle，下面是代码：
<div id='selectors'><span>A-F</span><span>G-L</span><span>M-S</span><span>T-Z</span></div>
<a hreh=#>Astring</a>
<a hreh=#>Cstring</a>
<a hreh=#>Xstring</a>
<a hreh=#>Dstring</a>
<a hreh=#>Zstring</a>
$('div#selectors span').click(function(){
expression = "/^["+$(this).html()+"].*$/";
rx = RegExp(expression,'i');
console.log(rx,'expression');
$("a").each(function(){
if($(this).html().match(rx) !== null){
$(this).addClass('selected');
}
});
})
回答by Madara's Ghost
JavaScript automatically adds "/" at the end and the beginning of the expression. Remove them from your string, Example Here
JavaScript 会自动在表达式的末尾和开头添加“/”。从您的字符串中删除它们，示例在这里
$('div#selectors span').click(function () {
var expression = "^[" + $(this).html() + "].*$";
var rx = new RegExp(expression, 'i');
console.log(rx, 'expression');
$("a").each(function () {
if ($(this).html().match(rx) !== null) {
$(this).addClass('selected');
}
});
});
