using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?=.*\b(?:one|two|three|four|five|six|seven|eight|nine)\b)(\b(?:one|two|three)(?:\s+(?:one|two|three))*\b)?.+?(\b(?:four|five|six)(?:\s+(?:four|five|six))*\b)?.+?(\b(?:seven|eight|nine)(?:\s+(?:seven|eight|nine))*\b)?";
string input = @"one two three four five six seven eight nine
two three four
";
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