using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(\d*)(-)?(\d*)?$";
string input = @"3
1000
15-20
20-15
10-20/2
1-1000/20
Above should be legal; this and below should be illegal
3
03
2 43
2x3
23x
15 - 20
15--30
15-03
15-20-30
1 5-20
15-2 0
15-/20
15/2-2
15/10/2";
RegexOptions options = RegexOptions.Multiline;
Match m = Regex.Match(input, pattern, options);
Console.WriteLine("'{0}' found at index {1}", m.Value, m.Index);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx