c# 正则表达式 匹配中括号&颜色过滤

 1         /// <summary>         
 2         /// 取得所有匹配项的下标
 3         /// </summary>         
 4         /// <param name="source">原内容</param>         
 5         /// <returns>返回匹配列表的下标</returns>         
 6         public static int[] GetColorIndexGroup(string source)
 7         {
 8             // 定义正则表达式用来匹配  
 9             Regex reg = new Regex("\\[color.*?\\]", RegexOptions.IgnoreCase);
10 
11             //将匹配到的项替换为空
12             //var newSource = reg.Replace(source, "");
13 
14             // 搜索匹配的字符串             
15             MatchCollection matches = reg.Matches(source);
16 
17             int i = 0;
18             int[] colorGroup = new int[matches.Count];
19             // 取得匹配项列表             
20             foreach (Match match in matches)
21             {
22                 colorGroup[i++] = match.Index;
23             }
24             return colorGroup;
25         }