using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?!\d+,\d+\.\d+,|\d+\.\d+,\d+.)^([+-]?(?:\d+|\d{1,3}(?:[.,]\d{3})*)(?:[.,]\d+|[eE][+-]?(?:\d+|\d{1,3}(?:[.,]\d{3})*))?)$";
string input = @"1
1.1
1,1
1,000,000.20
1.00000020
1.000.000,20
10.20001
24568221.94827
347,543,291.01
12e20
1e9
1e-9
1,009e10
10009e10
123,456.543
+123,456,789
-123,456,789
1,234583,213
1.234,568.78
123,456.543,456";
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