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string str="a%b!c!d@e&";
Regex re = new Regex(@"(?i)[a-z]*");
StringBuilder strbuilder = new StringBuilder();
foreach (Match mc in re.Matches(str))
{
strbuilder.Append(mc.Value);
}
str = strbuilder.ToString();
string str="a%b!c!d@e&";
Regex re = new Regex(@"[%!@&]*");
str = re.Replace(str, "");