在Javascript中匹配正则表达式字符串

Does anyone know how to find regular expression string from javascript code? e.g. var pattern = /some regular expression/;

有谁知道如何从javascript代码中找到正则表达式字符串？例如var pattern = /一些正则表达式/;

Is it possible to to with regular expression :) ?

有可能用正则表达式:)？

3 个解决方案

#1

If I got your question right, and you need a regular expression which would find all the regular expressions in a JavaScript program, then I don't think it is possible. A regular expression in JavaScript does not have to use the // syntax, it can be defined as a string. Even a full-blown JavaScript parser would not be smart enough to detect a regular expression here, for instance:

如果我的问题是正确的，并且您需要一个能够在JavaScript程序中找到所有正则表达式的正则表达式，那么我认为这是不可能的。 JavaScript中的正则表达式不必使用//语法，可以将其定义为字符串。即使是完整的JavaScript解析器也不够智能，无法在此处检测正则表达式，例如：

var re = "abcde";
var regexClass = function() { return RegExp; }
var regex = new regexClass()(re);

So I would give up this idea unless you want to cover only a few very basic cases.

所以我会放弃这个想法，除非你只想涵盖几个非常基本的案例。

#2

You want a regex to match a regex? Crazy. This might cover the simplest cases.

你想要正则表达式匹配正则表达式？疯。这可能涵盖最简单的情况。

new RegExp("\/.+\/")

However, I peeked into the Javascript Textmate bundle and is has 2 regex for finding a regex start and end.

但是，我偷看了Javascript Textmate包，并且有2个正则表达式用于查找正则表达式的开始和结束。

begin = '(?<=[=(:]|^|return)\s*(/)(?![/*+{}?])'
end   = '(/)[igm]*';

Which you could probably use as inspiration for toward your goal.

您可以将其用作实现目标的灵感。

#3

Thanks for answers I have found also that it is nearly impossible task to do, but here is my regex which parses source code just fine:

感谢您的回答我也发现这几乎是不可能完成的任务，但这里是我的正则表达式解析源代码就好了：

this.mainPattern = new RegExp(//single line comment
                           "(?://.*$)|"+
                           //multiline comment
                           "(/\\*.*?($|\\*/))"+
                           //single or double quote strings
                           "|(?:(?:\"[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*\")|(?:'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'))"+
                           //regular expression literal in javascript code
                           "|(?:(?:[/].+[/])[img]?[\\s]?(?=[;]|[,]|[)]))"+
                           //brackets
                           "|([{]|[(]|[\[])|([}]|[)]|[\\]])", 'g');

#1

var re = "abcde";
var regexClass = function() { return RegExp; }
var regex = new regexClass()(re);