Question

I want to match comma separate integer list using Regex. I have used bellow pattern but it doesn’t work for me.

if (!Regex.IsMatch(textBox_ImportRowsList.Text, @"^([0-9]+(,[0-9]+))*"))
{
        errorProvider1.SetError(label_ListRowPosttext, "Row Count invalid!");
}

Valid Inputs:

1
1,2
1,4,6,10

Invalid Inputs:

1,
1.1
1,A
2,/,1
,1,3

Answer 1

You’ve got the asterisk in the wrong place. Instead of this:

@"^([0-9]+(,[0-9]+))*"

…use this:

@"^([0-9]+(,[0-9]+)*)"

Additionally, you should anchor the end like you did the beginning, and don’t really need the outermost set of parentheses:

@"^[0-9]+(,[0-9]+)*$"