Question

我正在尝试从utf8文本文件中找到一种过滤表情符号的方法。显然有一个javascript正则表达式可用（https://raw.githubusercontent.com/mathiasbynens/emoji-regex/master/index.js），可以用来匹配表情符号。我无法将此正则表达式转换为c＃dialect（看起来有一些我不明白的差异）。然后我尝试使用简单的代码来匹配我的文本中的所有非单词和非空格字符（手动检查它们并选择表情符号，然后将它们放在正则表达式中并用空字符串替换它们。）

string input = @"some path\";
            List<char> emojis = new List<char>();
            foreach(FileInfo file in new DirectoryInfo(input).GetFiles("*.txt", SearchOption.AllDirectories))
            {
                MatchCollection matches = Regex.Matches(File.ReadAllText(file.FullName), @"[^\w\s]{1}");
                foreach(Match match in matches)
                {
                    string value = match.Value;
                    foreach(char c in value.ToCharArray())
                    {
                        if(!emojis.Contains(c))
                        {
                            emojis.Add(c);
                        }
                    }
                }
            }
            foreach(char c in emojis)
            {
                File.AppendAllText(@"\\Emojis.txt", c.ToString()+"|");
            }

但是我在#develop

中得到了例外

System.Text.EncoderFallbackException：无法翻译Unicode 索引0到指定代码页的字符\ uD83D。显然，将正则表达式匹配的字符转换为字符并不是一个好主意。任何想法如何解决这个问题？此致

Answer 1

这是我在Visual Studio中运行的代码，它执行时没有问题。

string regex = "(?:0\x20E3|1\x20E3|2\x20E3|3\x20E3|4\x20E3|5\x20E3|6\x20E3|7\x20E3|8\x20E3|9\x20E3|#\x20E3|\\*\x20E3|\xD83C(?:\xDDE6\xD83C(?:\xDDE8|\xDDE9|\xDDEA|\xDDEB|\xDDEC|\xDDEE|\xDDF1|\xDDF2|\xDDF4|\xDDF6|\xDDF7|\xDDF8|\xDDF9|\xDDFA|\xDDFC|\xDDFD|\xDDFF)|\xDDE7\xD83C(?:\xDDE6|\xDDE7|\xDDE9|\xDDEA|\xDDEB|\xDDEC|\xDDED|\xDDEE|\xDDEF|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF6|\xDDF7|\xDDF8|\xDDF9|\xDDFB|\xDDFC|\xDDFE|\xDDFF)|\xDDE8\xD83C(?:\xDDE6|\xDDE8|\xDDE9|\xDDEB|\xDDEC|\xDDED|\xDDEE|\xDDF0|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF5|\xDDF7|\xDDFA|\xDDFB|\xDDFC|\xDDFD|\xDDFE|\xDDFF)|\xDDE9\xD83C(?:\xDDEA|\xDDEC|\xDDEF|\xDDF0|\xDDF2|\xDDF4|\xDDFF)|\xDDEA\xD83C(?:\xDDE6|\xDDE8|\xDDEA|\xDDEC|\xDDED|\xDDF7|\xDDF8|\xDDF9|\xDDFA)|\xDDEB\xD83C(?:\xDDEE|\xDDEF|\xDDF0|\xDDF2|\xDDF4|\xDDF7)|\xDDEC\xD83C(?:\xDDE6|\xDDE7|\xDDE9|\xDDEA|\xDDEB|\xDDEC|\xDDED|\xDDEE|\xDDF1|\xDDF2|\xDDF3|\xDDF5|\xDDF6|\xDDF7|\xDDF8|\xDDF9|\xDDFA|\xDDFC|\xDDFE)|\xDDED\xD83C(?:\xDDF0|\xDDF2|\xDDF3|\xDDF7|\xDDF9|\xDDFA)|\xDDEE\xD83C(?:\xDDE8|\xDDE9|\xDDEA|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF6|\xDDF7|\xDDF8|\xDDF9)|\xDDEF\xD83C(?:\xDDEA|\xDDF2|\xDDF4|\xDDF5)|\xDDF0\xD83C(?:\xDDEA|\xDDEC|\xDDED|\xDDEE|\xDDF2|\xDDF3|\xDDF5|\xDDF7|\xDDFC|\xDDFE|\xDDFF)|\xDDF1\xD83C(?:\xDDE6|\xDDE7|\xDDE8|\xDDEE|\xDDF0|\xDDF7|\xDDF8|\xDDF9|\xDDFA|\xDDFB|\xDDFE)|\xDDF2\xD83C(?:\xDDE6|\xDDE8|\xDDE9|\xDDEA|\xDDEB|\xDDEC|\xDDED|\xDDF0|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF5|\xDDF6|\xDDF7|\xDDF8|\xDDF9|\xDDFA|\xDDFB|\xDDFC|\xDDFD|\xDDFE|\xDDFF)|\xDDF3\xD83C(?:\xDDE6|\xDDE8|\xDDEA|\xDDEB|\xDDEC|\xDDEE|\xDDF1|\xDDF4|\xDDF5|\xDDF7|\xDDFA|\xDDFF)|\xDDF4\xD83C\xDDF2|\xDDF5\xD83C(?:\xDDE6|\xDDEA|\xDDEB|\xDDEC|\xDDED|\xDDF0|\xDDF1|\xDDF2|\xDDF3|\xDDF7|\xDDF8|\xDDF9|\xDDFC|\xDDFE)|\xDDF6\xD83C\xDDE6|\xDDF7\xD83C(?:\xDDEA|\xDDF4|\xDDF8|\xDDFA|\xDDFC)|\xDDF8\xD83C(?:\xDDE6|\xDDE7|\xDDE8|\xDDE9|\xDDEA|\xDDEC|\xDDED|\xDDEE|\xDDEF|\xDDF0|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF7|\xDDF8|\xDDF9|\xDDFB|\xDDFD|\xDDFE|\xDDFF)|\xDDF9\xD83C(?:\xDDE6|\xDDE8|\xDDE9|\xDDEB|\xDDEC|\xDDED|\xDDEF|\xDDF0|\xDDF1|\xDDF2|\xDDF3|\xDDF4|\xDDF7|\xDDF9|\xDDFB|\xDDFC|\xDDFF)|\xDDFA\xD83C(?:\xDDE6|\xDDEC|\xDDF2|\xDDF8|\xDDFE|\xDDFF)|\xDDFB\xD83C(?:\xDDE6|\xDDE8|\xDDEA|\xDDEC|\xDDEE|\xDDF3|\xDDFA)|\xDDFC\xD83C(?:\xDDEB|\xDDF8)|\xDDFD\xD83C\xDDF0|\xDDFE\xD83C(?:\xDDEA|\xDDF9)|\xDDFF\xD83C(?:\xDDE6|\xDDF2|\xDDFC)))|[\xA9\xAE\x203C\x2049\x2122\x2139\x2194-\x2199\x21A9\x21AA\x231A\x231B\x2328\x23CF\x23E9-\x23F3\x23F8-\x23FA\x24C2\x25AA\x25AB\x25B6\x25C0\x25FB-\x25FE\x2600-\x2604\x260E\x2611\x2614\x2615\x2618\x261D\x2620\x2622\x2623\x2626\x262A\x262E\x262F\x2638-\x263A\x2648-\x2653\x2660\x2663\x2665\x2666\x2668\x267B\x267F\x2692-\x2694\x2696\x2697\x2699\x269B\x269C\x26A0\x26A1\x26AA\x26AB\x26B0\x26B1\x26BD\x26BE\x26C4\x26C5\x26C8\x26CE\x26CF\x26D1\x26D3\x26D4\x26E9\x26EA\x26F0-\x26F5\x26F7-\x26FA\x26FD\x2702\x2705\x2708-\x270D\x270F\x2712\x2714\x2716\x271D\x2721\x2728\x2733\x2734\x2744\x2747\x274C\x274E\x2753-\x2755\x2757\x2763\x2764\x2795-\x2797\x27A1\x27B0\x27BF\x2934\x2935\x2B05-\x2B07\x2B1B\x2B1C\x2B50\x2B55\x3030\x303D\x3297\x3299]|\xD83C[\xDC04\xDCCF\xDD70\xDD71\xDD7E\xDD7F\xDD8E\xDD91-\xDD9A\xDE01\xDE02\xDE1A\xDE2F\xDE32-\xDE3A\xDE50\xDE51\xDF00-\xDF21\xDF24-\xDF93\xDF96\xDF97\xDF99-\xDF9B\xDF9E-\xDFF0\xDFF3-\xDFF5\xDFF7-\xDFFF]|\xD83D[\xDC00-\xDCFD\xDCFF-\xDD3D\xDD49-\xDD4E\xDD50-\xDD67\xDD6F\xDD70\xDD73-\xDD79\xDD87\xDD8A-\xDD8D\xDD90\xDD95\xDD96\xDDA5\xDDA8\xDDB1\xDDB2\xDDBC\xDDC2-\xDDC4\xDDD1-\xDDD3\xDDDC-\xDDDE\xDDE1\xDDE3\xDDEF\xDDF3\xDDFA-\xDE4F\xDE80-\xDEC5\xDECB-\xDED0\xDEE0-\xDEE5\xDEE9\xDEEB\xDEEC\xDEF0\xDEF3]|\xD83E[\xDD10-\xDD18\xDD80-\xDD84\xDDC0]";
string input = "aedfvwefervsreA";
var result = Regex.Match(input, regex);

我没有测试字符串来查看它是否产生了正确的结果，但这应该是C＃中Javascript模式的一对一表示。

在C＃中匹配表情符号

1 个答案: