using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=Building: )[A-Z]+(?: (?!UNIT\b)[A-Z]+\b)*";
string input = @"Building: BUILDING ONE 15 [building name followed by unit number]
Optional preceding text Building: BUILDING ONE 15 [preceding text, then building name followed unit number]
Building: BUILDING ONE UNIT 15 [building name followed by word UNIT and unit number]
Building: BUILDING ONE Floor 2 [building name followed by mixed case word]
Grounds: OPEN SPACE WEST Section 3 [not a building - return nothing]";
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