using System;
using System.Text.RegularExpressions;
 
class program
{
static void Main(string[] args)
{
string text = txt();
string pattern = @"t$";
Regex reg = new Regex(pattern);
MatchCollection m = reg.Matches(text);
show(reg,m);
}
 
static void show(Regex reg, MatchCollection m)
{
Console.WriteLine("  # of matches is : {0} ",m.Count);
foreach(Match match in m)
{
Console.WriteLine("value : {0}\n", match.Value);
 
Console.WriteLine(MatchedWord(match,txt()));
 
 
}
}
static string MatchedWord(Match match, string text)
{
int index = match.Index;
string sp ="";
string ss ="";
for(int i=index;i<100;i++)
{
ss+=text[i];
if(text[i].Equals(" ")) break;
}
for(int i=index;i<100;i--)
{
sp+=text[i];
if(text[i].Equals(" ")) break;
}
 
return sp+match.Value+ss;
}
 
static string txt()
{
 
string text = "A string is an object of type String whose value is text. Internally, the text is stored as a sequential read-only collection of Char objects. There's no null-terminating character at the end of a C# string; therefore a C# string can contain any number of embedded null characters ('\0'). The Length property of a string represents the number of Char objects it contains, not the number of Unicode characters. To access the individual Unicode code points in a string, use the StringInfo object";
return text;
}
}

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