正则表达式捕获组迅速

问题描述

我在字符串中有一个正则表达式搜索方法：

I have a regex search method in string:

extension String {
    func searchRegex (regex: String) -> Array<String> {
        do {
            let regex = try NSRegularExpression(pattern: regex, options: NSRegularExpressionOptions(rawValue: 0))
            let nsstr = self as NSString
            let all = NSRange(location: 0, length: nsstr.length)
            var matches : Array<String> = Array<String>()
            regex.enumerateMatchesInString(self, options: NSMatchingOptions(rawValue: 0), range: all) {
                (result : NSTextCheckingResult?, _, _) in
                let theResult = nsstr.substringWithRange(result!.range)
                matches.append(theResult)
            }
            return matches
        } catch {
            return Array<String>()
        }
    }
}

它运作良好。但如果我有正则表达式 product_title：\ ['（。*）'它会返回 product_title：[\'s标题bla bla \'但我只需要零件（。*）。

It works good. But if i have a regular expression product_title:\['(.*)' it returns me product_title:[\'Some title bla bla\' but i only need the part (.*).

I我是swift的新手，但是在python中这个问题通过使用 groups（）函数解决了。如何在swift中使用捕获组。请举个例子。

I'm new in swift, but in python this problem solved by using groups() function. How to use capture group in swift. Please give me example.

推荐答案

NSTextCheckingResult 有 numberOfRanges 属性和 rangeAtIndex（）方法，可让您获取各个捕获组的范围。因此，如果您想要第一个捕获组而不是整个匹配的字符串，您可以将代码修改为：

NSTextCheckingResult has a numberOfRanges property and a rangeAtIndex() method that lets you grab the range for individual capture groups. So if you wanted the first capture group instead of the whole matched string, you would modify your code to:

        var matches : Array<String> = Array<String>()
        regex.enumerateMatchesInString(self, options: NSMatchingOptions(rawValue: 0), range: all) {(result : NSTextCheckingResult?, _, _) in
            let capturedRange = result!.rangeAtIndex(1)
            if !NSEqualRanges(capturedRange, NSMakeRange(NSNotFound, 0)) {
                let theResult = nsstr.substringWithRange(result!.rangeAtIndex(1))
                matches.append(theResult)
            }
        }

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