using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"((?:(?(?=Fig\.|\d+\.\d).+?(?=\s)|[^.!?])+(?=\.))+)";
string input = @"This sentence should be captured because it contains the number 20.
This sentence should be captured because it contains the reference term 20AA.
This sentence should not be captured because it does not contain a number or reference term.
";
RegexOptions options = RegexOptions.IgnoreCase;
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