using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^([1-9]\.[4-9]{1}|[2-9]{0,9}\.[0-9]{1}|[0-9]{2,9}\.[0-9]{1}|[2-9]{0,9})$";
string input = @"1.0
1.1
1.2
1.3
1.4
1.45
1.5
10.3
15.9
20.2
25
99.1
100.5
1000.2
99999.99
99999.9
";
RegexOptions options = RegexOptions.IgnoreCase | 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