将shell通配符转换为正则表达式 [英] Converting shell wildcards to regex

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问题描述

我想使用shell通配符搜索标题,例如 * .js *。*。* 等。在js。事情是我循环标题列表,我需要使用js正则表达式测试过滤文件。如何以一种好的方式将shell通配符转换为正则表达式,或者是否有任何已经执行此操作的库?

I want to search for titles using shell wildcards like *.js, *.*.* etc. in js. The thing is I loop through a list of titles and I need to filter the files using a js regex test. How do I convert shell wildcards to regex in a good way or are there any libraries that already does that?

注意:我想要从shell通配符到regex的通用转换器。

Note: I want a generic converter from shell wildcards to regex.

推荐答案

如果你想要一个通用的转换器功能,这应该有效:

If you want a generic converter function, this should work:

function globStringToRegex(str) {
    return new RegExp(preg_quote(str).replace(/\\\*/g, '.*').replace(/\\\?/g, '.'), 'g');
}
function preg_quote (str, delimiter) {
    // http://kevin.vanzonneveld.net
    // +   original by: booeyOH
    // +   improved by: Ates Goral (http://magnetiq.com)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Onno Marsman
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: preg_quote("$40");
    // *     returns 1: '\$40'
    // *     example 2: preg_quote("*RRRING* Hello?");
    // *     returns 2: '\*RRRING\* Hello\?'
    // *     example 3: preg_quote("\\.+*?[^]$(){}=!<>|:");
    // *     returns 3: '\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:'
    return (str + '').replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\' + (delimiter || '') + '-]', 'g'), '\\$&');
}

(preg_quote函数来自: http://phpjs.org/functions/preg_quote/ )。

(preg_quote function from here: http://phpjs.org/functions/preg_quote/).

使用:

var realRegex = globStringToRegex("2012-*-*.js"); //returns a RegExp object of /2012\-.*\-.*\.js/g

这是一个工作的JS小提琴:

Here's a JS fiddle of it working:

http:// jsfiddle.net/d5sdw/2/

然后您可以使用RegExp对象进行匹配:

You can then use the RegExp object to match:

if (yourString.match(realRegex)) { //do something

更新:支持单个通配符的

Update: Supports ? for single wildcard character.

基本上全部这样做是将整个字符串转换为非正则表达式,然后确保 * 映射到。* 被映射到,因为它们是等效的。

Basically all this does is convert the whole string to non regex, and then makes sure that * gets mapped to .* and ? gets mapped to ., as they're the equivalent.

这篇关于将shell通配符转换为正则表达式的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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