using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"[\r\n]?BEGIN(?:(?!FALSE|END).)*?FALSE(?:(?!FALSE|END).)*?END";
string substitution = @"";
string input = @"BEGIN
DESCRIPTION: 1234
BOOL:TRUE
END
BEGIN
DESCRIPTION: 4568
BOOL:TRUE
END
BEGIN
DESCRIPTION: 715310
BOOL:FALSE
END
BEGIN
DESCRIPTION: 12489453
BOOL:TRUE
END
BEGIN
DESCRIPTION: 41543
BOOL:FALSE
END";
RegexOptions options = RegexOptions.Singleline;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
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