I need to get only the last number from the string. The string contains pattern of string+integer+string+integer i.e. "GS190PA47". I need to get only 47 from the string.
Thank you
3
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Google "regular expressions", and try this tool to experiment derekslager.com/blog/posts/2007/09/…Anders Forsgren– Anders Forsgren2013-04-05 09:17:21 +00:00Commented Apr 5, 2013 at 9:17
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If you need only 47 , the easiest way is substring the last two character of your string :)zey– zey2013-04-05 09:21:05 +00:00Commented Apr 5, 2013 at 9:21
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is the format fix? 2 string + 3 int + 2 string + 2 int?John Woo– John Woo2013-04-05 09:21:11 +00:00Commented Apr 5, 2013 at 9:21
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5 Answers
A simple regular expression chained to the end of the string for any number of integer digits
string test = "GS190PA47";
Regex r = new Regex(@"\d+$");
var m = r.Match(test);
if(m.Success == false)
Console.WriteLine("Ending digits not found");
else
Console.WriteLine(m.ToString());
Comments
string input = "GS190PA47";
var x = Int32.Parse(Regex.Matches(input, @"\d+").Cast<Match>().Last().Value);
If string always ends with number, you can simply use \d+$ pattern, as Steve suggests.
answered Apr 5, 2013 at 9:20
Sergey Berezovskiy
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Comments
Try this:
string input = "GS190PA47";
Regex r = new Regex(@"\d+\D+(\d+)");
int number = int.Parse(r.Match(input).Groups[1].Value);
Pattern means we find set of digits (190), next set of non-digit chars (PA) and finally sought-for number.
Don't forget include using System.Text.RegularExpressions directive.
Comments
Not sure if this is less or more efficient than RegEx (Profile it)
string input = "GS190PA47";
var x = Int32.Parse(new string(input.Where(Char.IsDigit).ToArray()));
Edit:
Amazingly it is actually much faster than regex
var a = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
string input = "GS190PA47";
var x = Int32.Parse(new string(input.Reverse().TakeWhile(Char.IsDigit).Reverse().ToArray()));
}
a.Stop();
var b = a.ElapsedMilliseconds;
Console.WriteLine(b);
a = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
string input = "GS190PA47";
var x = Int32.Parse(Regex.Matches(input, @"\d+").Cast<Match>().Last().Value);
}
a.Stop();
b = a.ElapsedMilliseconds;
Console.WriteLine(b);
2 Comments
Lenny D
Granted not quite what you were after but food for thought. Could use SkipWhile or Substring if the structure is deterministic.
George Duckett
This would get all numbers in the input (joined together), not just the last one.