using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^[1-9]\d*(?:[ -]?(?:[a-zA-Z]+|[1-9]\d*))?$";
string input = @"25
25 a
25b
25-ab
12-14
1
9
21
1a
121 b
25A
25 a
1 a1
1a1
12ab12
0
b
0a
00a
a a
00 a
13àâäèéêë
";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(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