c# get string that matches using regex code example

Example 1: c# regex get matched string

Regex filter = new Regex(@"(\d+)");

foreach (var item in checkedListBox1.CheckedItems)
{
    var match = filter.Match(item.ToString());
    if (match.Success)
    {
        MessageBox.Show(match.Value);
    }    
}

Example 2: c# regex match

var regex = new Regex(@"(?<=%download%#)\d+");
return regex.Matches(strInput);