using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?P<q_num>\d{1,3})\)\s?(?P<quest>.+)\n(\s?a\)\s?)(?P<ans_a>.+)(b\)\s?)(?P<ans_b>.+)((c\)\s?)(?P<ans_c>.+))?((d\)\s?)(?P<ans_d>.+))?";
string input = @"1) First question with 4 choices ?
a) First choice b) Second choice c) Third choice d) Last choice
2) Second question with only 3 choices ?
a) First choice b) Second choice c) Last choice
3) True or False ?
a) True b) False";
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