using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:[0-9]*\s*[pP](?:\.O\.|o)(?:st(?:al)?\soffice\s)*[bB]ox(?:\sstreet)?)$";
string input = @"P.O.Box
pobox
post office box
box
BOX
poor box etc.,
1234 post office box street
123 postal office box
";
RegexOptions options = 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