如何使用依赖于变量的模式执行Javascript匹配？

The current implementation of Remy Sharp's jQuery tag suggestion plugin only checks for matches at the beginning of a tag. For example, typing "Photoshop" will not return a tag named "Adobe Photoshop".

Remy Sharp的jQuery标签建议插件的当前实现仅检查标签开头的匹配。例如，键入“Photoshop”将不会返回名为“Adobe Photoshop”的标签。

By default, the search is case-sensitive. I have slightly modified it to trim excess spaces and ignore case:

默认情况下，搜索区分大小写。我稍微修改了它以修剪多余的空格并忽略大小写：

for (i = 0; i < tagsToSearch.length; i++) {
    if (tagsToSearch[i].toLowerCase().indexOf(jQuery.trim(currentTag.tag.toLowerCase())) === 0) {
        matches.push(tagsToSearch[i]);
    }
}

What I have tried to do is modify this again to be able to return "Adobe Photoshop" when the user types in "Photoshop". I have tried using match, but I can't seem to get it to work when a variable is present in the pattern:

我试图做的是再次修改它，以便当用户键入“Photoshop”时能够返回“Adobe Photoshop”。我尝试过使用匹配，但是当模式中存在变量时，我似乎无法使其工作：

for (i = 0; i < tagsToSearch.length; i++) {
    var ctag = jQuery.trim(currentTag.tag);
    if (tagsToSearch[i].match("/" + ctag + "/i")) { // this never matches, presumably because of the variable 'ctag'
        matches.push(tagsToSearch[i]);
    }
}

What is the correct syntax to perform a regex search in this manner?

以这种方式执行正则表达式搜索的正确语法是什么？

3 个解决方案

#1

If you want to do regex dynamically in JavaScript, you have to use the RegExp object. I believe your code would look like this (haven't tested, not sure, but right general idea):

如果要在JavaScript中动态执行regex，则必须使用RegExp对象。我相信你的代码看起来像这样（没有测试，不确定，但正确的一般想法）：

for (i = 0; i < tagsToSearch.length; i++) {
    var ctag = jQuery.trim(currentTag.tag);
    var regex = new RegExp(ctag, "i")
    if (tagsToSearch[i].match(regex)) {
        matches.push(tagsToSearch[i]);
    }
}

#2

Instead of

代替

"/" + ctag + "/i"

Use

使用

new RegExp(ctag, "i")

#3

You could also continue to use indexOf, just change your === 0 to >= 0:

您还可以继续使用indexOf，只需将=== 0更改为> = 0：

for (i = 0; i < tagsToSearch.length; i++) {
    if (tagsToSearch[i].toLowerCase().indexOf(jQuery.trim(currentTag.tag.toLowerCase())) >= 0) {
        matches.push(tagsToSearch[i]);
    }
}

But then again, I may be wrong.

但话说回来，我可能错了。

#1