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string test = "[/表情1]jdf[/表情2][/表情34]jdflksjflsjlsjf";
test = Regex.Replace(test, @"\[/\D+(\d+)\]", "<img src=face/$1.gif>");
//<img src=face/1.gif>jdf<img src=face/2.gif><img src=face/34.gif>jdflksjflsjlsjf
string source = "[/表情1]jdf[/表情2][/表情34]jdflksjflsjlsjf";
Regex reg = new Regex(@"(?is)(/表情)(\d+)(])");
source = reg.Replace(source, "<img src=face/$2.gif>");