How Do I Numbers Allowed With Asterisk C# Regex

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C#

regular-expression

VS2012

Dear friends,

i'm trying to block numeric value input form txtbox using regular expression
i need allowed numbers with *

ex - 444 - not allowed
*444* - allowed

can anyone help me.

here is my code. i have tried but it's not working

else if (!Regex.IsMatch(txtLunchinput.Text, ".*[a-zA-Z]+.*"))
            {
                MessageBox.Show("Wrong!");
                return;
            }