如何使用依赖于变量的模式执行Javascript匹配? [英] How do I perform a Javascript match with a pattern that depends on a variable?

问题描述

Remy Sharp的jQuery标签建议插件的当前实现仅检查标记开头的匹配项.例如，键入"Photoshop"将不会返回名为"Adob​​e Photoshop"的标签.

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".

默认情况下，搜索区分大小写.我对它进行了少许修改以修剪多余的空间并忽略大小写:

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

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

我试图做的是再次修改此内容，以便当用户键入"Photoshop"时能够返回"Adob​​e Photoshop".我尝试使用match，但是当模式中存在变量时，我似乎无法使它工作:

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:

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]);
    }
}

以这种方式执行正则表达式搜索的正确语法是什么?

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

推荐答案

如果要在JavaScript中动态进行正则表达式，则必须使用

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):

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]);
    }
}

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