You could use regular expressions, e.g:
class Program
{
static void Main(string[] args)
{
var input = " SUCCESS Post Policy Success INVOICE No. :: WS1704003404 || Policy No :: 59203313 || App No. :: 123456724 ";
var pattern = @"::\s*(\w+)\s*";
var matches = Regex.Matches(input, pattern);
foreach (Match match in matches)
Console.WriteLine(match.Groups[1].Value);
}
}
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solved Get Substring – everything before and after certain characters [closed]