using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<!\w)\d[.\d]*(?!\w)";
string input = @"Theses are some of the fail cases that I am looking to
avoid variable123 or variable_123name or _123_,
where some of the acceptable cases are |123| or +123+ $123 123% #124523 ext... 11 2123 123% 0.12 1.1.3.4.4 12 1 23452 23423| ext...[";
foreach (Match m in Regex.Matches(input, pattern))
{
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