using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^-0$|^-?0\d+(?:\.\d+)?$|^(-?\d+(?:.\d{1,4})?)$";
string input = @"0
0.1
0.12
0.123
0.1234
1
1.1
123456789.1234
-0.1
-0.12
-0.123
-0.1234
-1
-1.1
-123456789.1234
-
+
-0
0123456789.1234
007
+0.1
+123456789.1234
.1234
1.";
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