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string test = "<Font Face='Arial' Size='9' Color='-16777216'>ddddddddddddd </Font>";
string result = Regex.Replace(test, @"(?<=<font[^>]*?)\ssize='[^']*'(?=[^>]*>)", "", RegexOptions.IgnoreCase);
string test = "<Font Face='Arial' Size='9' Color='-16777216'>ddddddddddddd </Font>";
string result = Regex.Replace(test, @"(?<=<Font[^>]*?Face=')[^']*(?=')", "face1", RegexOptions.IgnoreCase);
result = Regex.Replace(result, @"(?<=<Font[^>]*?Size=')[^']*(?=')", "size1", RegexOptions.IgnoreCase);