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C# Regular Expression to skip some special characters
private bool IsValid(string str)
 {
    Regex r = new Regex(@"[a-z][^<>%'=$]");
    Console.WriteLine(str + " : " + r.IsMatch(str).ToString());
    return r.IsMatch(str);
 }

"a<>'b=b"
 "abc"
 "a$b"
"123"
"IHH"

private bool IsValid(string str)
 {
    Regex r = new Regex(@"^[a-z]+$");
    Console.WriteLine(str + " : " + r.IsMatch(str).ToString());
    return r.IsMatch(str);
 }

var pat = /^[a-z]+$/;