using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?|([a-zA-Z0-9]+)\(([a-zA-Z\s]+)\)|\(([a-zA-Z\s]+)\)([a-zA-Z0-9]+))";
string input = @"(Weather) is good. // not need to mark this beacuase this word konown word
Weath(er) is good. // mark
Weath(er is good). // mark
Weather (is) (good).
My name is Rah(eel) // mark
Best pro(duct) // mark
(Weather is good) // not need to mark this beacuase this word konown word
we(ather)
(weath)er is good. // i want to mark this word
(weath)er // i want to mark this word
weather(is fine)
";
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