正则表达式匹配Text与Square Brackets

时间:2014-09-23 20:44:32

标签: javascript regex node.js

使用javascript我需要从字符串中获取文本和标记,如:

"type":"homePhone","means":"$[createJohnRequest.contactInfo[type=homePhone].means]"

这样正则表达式将返回:

$[createJohnRequest.contactInfo[type=homePhone].means]

我有几次尝试,但没有一个可行:

/(\$\[(.*?]))/g  

将返回:$ [createJohnRequest.contactInfo [type = homePhone]

/(\$\[(.*]))/g 

这适用于上述情况,但对于像以下情况一样过于贪心:

{"firstName":"$[user.firstName]","userName":"$[user.username1]","details":
{"description":"this is $[user.username1] the $[user.username2] text th $[user.username3] 
at conta$[user.username4]ins the terms we want to find. $[final.object]"}}

理想情况下,我希望单个正则表达式在多行文本中匹配:

some text here $[some.value.here]bunch of noisy text in between here
some more text here$[some.value[index]goes.here]some more noise here

$ [some.value.here]和$ [some.value [index] .goes.here]

任何人都有任何想法指出我正确的方向吗?

我倾向于使用$ [some token] $而不是捕获它。

1 个答案:

答案 0 :(得分:0)

你想要这样的东西,只要括号嵌套级别限制为两个:

/\$\[(\[.*]|.)*?\]/g

英文:

a dollar sign followed by 
a bracketed sequence whose content is
    any number of occurrences of 
        either 
            a bracketed subsequence whose content is anything
            or something else

请参阅http://regexr.com/39iht

如果你想支持更深层次的嵌套,我建议你写一些函数来为你构建正则表达式,这样你就不会疯狂:

function make_regexp(level) {
    var build = "\\[.*?]";
    while (level--) {
        build = "(\\[" + build + "]|.)*?";
    }
    return RegExp("\\$" + build, "g");
}

> make_regexp(3)
/\$(\[(\[(\[.*]|.*)*?]|.*)*?]|.*)*?/g
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