using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:(?<=\.\s)|^)[A-Z][^.A-Z]*(?:(?:[A-Z]\.|\.\s\d)[^.A-Z]*)*\bnice one\b.+?(?=\s[A-Z])";
string input = @"One sentence here, much wow. Another one here. This is O.N.E. example n. 1, a nice one to understand. Hope it's clear now!
This is O.N.E. example n. 1, a nice one to understand. Hope it's clear now!";
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