using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?s)(.*?(?:\.|[.?!](?:\[\d+\])+))(?:\s+|\s*\Z)";
string input = @"Van der Weyden was preoccupied by commissioned portraiture towards the end of his life[1] and was highly regarded by later generations of painters for his penetrating evocations of character. In this work, the woman's humility and reserved demeanour are conveyed through her fragile physique, lowered eyes and tightly grasped fingers.[2] She is slender and depicted according to the Gothic ideal of elongated features, indicated by her narrow shoulders, tightly pinned hair, high forehead and the elaborate frame set by the headdress.[3][4][5] It is the only known portrait of a woman accepted as an autograph work by van der Weyden,[1][3] yet the sitter's name is not recorded and he did not title the work![21][14][5][8][10]";
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