From f2468d16d71b9e535e9489d32bf8233fe1fe96e4 Mon Sep 17 00:00:00 2001
From: nilaoda <nilaoda@live.com>
Date: Thu, 6 Apr 2023 15:40:51 +0800
Subject: [PATCH] =?UTF-8?q?=E8=87=AA=E5=8A=A8=E5=8E=BB=E9=99=A4VTT=20class?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

例如：
```
<c.background-color_transparent.font-family_monospace.font-style_normal.font-weight_normal>[bell tolls]</c>
<c.background-color_transparent.font-family_monospace.font-style_normal.font-weight_normal><b>[bell tolls]</b></c>
<c.background-color_transparent.font-family_monospace.font-style_normal.font-weight_normal>Is it open now,
dough boy?</c>
```
---
 src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs b/src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs
index 9bcbfe9..3bff876 100644
--- a/src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs
+++ b/src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs
@@ -15,6 +15,8 @@ namespace N_m3u8DL_RE.Common.Entity
         private static partial Regex TSValueRegex();
         [GeneratedRegex("\\s")]
         private static partial Regex SplitRegex();
+        [GeneratedRegex("<c\\..*?>([\\s\\S]*?)<\\/c>")]
+        private static partial Regex VttClassRegex();
 
         public List<SubCue> Cues { get; set; } = new List<SubCue>();
         public long MpegtsTimestamp { get; set; } = 0L;
@@ -88,7 +90,7 @@ namespace N_m3u8DL_RE.Common.Entity
                         {
                             StartTime = startTime,
                             EndTime = endTime,
-                            Payload = string.Join("", payload.Where(c => c != 8203)), //Remove Zero Width Space!
+                            Payload = RemoveClassTag(string.Join("", payload.Where(c => c != 8203))), //Remove Zero Width Space!
                             Settings = style
                         });
                         payloads.Clear();
@@ -120,6 +122,15 @@ namespace N_m3u8DL_RE.Common.Entity
             return webSub;
         }
 
+        private static string RemoveClassTag(string text)
+        {
+            if (VttClassRegex().IsMatch(text))
+            {
+                return VttClassRegex().Match(text).Groups[1].Value;
+            }
+            else return text;
+        }
+
         /// <summary>
         /// 从另一个字幕中获取所有Cue，并加载此字幕中，且自动修正偏移
         /// </summary>