javascript - Objective-C/Swift 正则表达式跨多行匹配

Question

我有一个最初在 python 中使用的正则表达式，用于从抓取的 HTML 页面中提取 2 个字符串: var\s+kaynaklar.*?url\s*:\s*\"([^\"]+ )\"\s*,\s*数据\s*:\s*'([^']+)

这在 Python 中工作正常，但在 Objective-C/Swift 中不行。

这是我用来查找结果的 Swift 2.0 代码:

do {
        let regexString = "var\\s+kaynaklar.*?url\\s*:\\s*\\\"([^\\\"]+)\\\"\\s*,\\s*data\\s*:\\s*'([^']+)"
        let regex = try NSRegularExpression(pattern: regexString, options: [])
        let nsString = text as NSString
        let results = regex.matchesInString(text,
            options: [], range: NSMakeRange(0, nsString.length))
        return results.map { nsString.substringWithRange($0.range)}
    } catch let error as NSError {
        print("invalid regex: \(error.localizedDescription)")
        return []
    }

这是在 HTML 中检查 JS 的示例，如下所示:

var kaynaklar = [];

jQuery.ajax({
    type:"POST",
    url:"/service/part",
    data:'id=31398',
    success:function(a){
        if(a=="hata")
        {
            jQuery("#player").html("<br><br><font style='color:white;'>Video kaynağı silinmiş lütfen sol üstten Kaynak butonuna tıklayarak farklı bir kaynak deneyin.</font>")
        }
        else
        {
            for (var i = 1; i < 6; i++) {
                if(a["videolink"+i])
                {
                    kaynaklar.push({"file":a["videolink"+i], "label":a["videokalite"+i],"type":"mp4"});
                }
            }
            video_loader();
        }
    },
    error:function(){
        jQuery("#player").html("<br><br><font style='color:white;'>Video yüklenirken bir hata oluştu lütfen sayfayı yenileyip tekrar deneyin veya farklı bir kaynak deneyin.</font>")
    }
})

Answer 1

根据您的反馈，我发现您只需要告诉正则表达式引擎将换行符与句点匹配即可。

使用NSRegularExpressionOptions.DotMatchesLineSeparators选项:

Allow . to match any character, including line separators.


Available in OS X v10.7 and later.

作为一种更快实现的替代方案，请在模式开头使用内联 (?s) 修饰符:

let regexString = "(?s)var\\s+kaynaklar.*?url\\s*:\\s*\\\"([^\\\"]+)\\\"\\s*,\\s*data\\s*:\\s*'([^']+)"

请参阅regex demo .