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//using System.Text.RegularExpressions;
protected void Page_Load(object sender, EventArgs e)
{
//asp.net test page
Response.Write(check("23432"));
Response.Write(check("*23432"));//true
Response.Write(check("*-23432"));
}
private bool check(string s)
{
return Regex.Match(s,@"^[\*\#]\d+|\d+\*$").Success;
}