using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:(?:http|https):\/\/)?(?:www.)?(?:instagram.com|instagr.am|instagr.com)\/(\w+)";
string input = @"http://instagram.com/username
http://instagram.com/username?modal=true
https://instagram.com/username
https://instagram.com/username?modal=true
http://www.instagram.com/username
http://www.instagram.com/username?modal=true
https://www.instagram.com/username
https://www.instagram.com/username?modal=true
instagram.com/username
instagram.com/username?modal=true
www.instagram.com/username
www.instagram.com/username?modal=true
http://instagr.am/username
http://instagr.am/username?modal=true
http://www.instagr.am/username
http://www.instagr.am/username?modal=true
https://instagr.am/username
https://instagr.com/username
https://instagr.am/username?modal=true
https://www.instagr.am/username
https://www.instagr.am/username?modal=true";
RegexOptions options = RegexOptions.IgnoreCase | 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