using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\blocation:\s*((?:(?!location:|unit|format).)+) (?:format )?unit (?:(?!location:).)+\b12345566\b";
string input = @"location: Paris format unit no serial no 12345. location: New York format unit no serial no 45764. location: Delhi format unit no serial no 34573.
Location: FD130 New York GA Unit Serial Purchase Order Sales Order Make Model Amount Tax Total 12345566 Location: FD130 Roswell GA Unit Serial Purchase Order Sales Order Make Model Amount Tax Total 0130029964
";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase;
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