using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^\d+(?:\.\d{2})?(?: ?& ?\d+(?:\.\d{2})?)*$";
string input = @"12
12.12
12 & 129.12 & 11
12 & 129. & 11
12 & .129
12 & 129..1
12 & 129.111
&&&1
12 ---> (pass)
12.12 ---> (pass)
12 & 129.12 & 11 --- >(pass)
12 & 129. & 11 ---> (should not pass)
12 & .129 ---> (should not pass)
12 & 129..1 (should not pass)
12 & 129.111 (should not pass)
&&&1 (should not pass)";
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