问包含由OR条件分隔的多个规则的正则表达式中命中的条件数

EN

string l_pattern = @"(?i)" + /*make the regex case-insensitive*/
                   @"(?=(?<Cond1>.*?Begin)+)?" +
                   @"(?=(?<Cond2>.*?Middle)+)?" +
                   @"(?=(?<Cond3>.*?End)+)?";

string l_input = "Oops - I put the middle first!" + 
                 "Hello this is Begin.This is another begin.";

var l_match = Regex.Match( l_input, l_pattern );

Console.WriteLine( "Cond1 matched {0} times.",
                   l_match.Groups["Cond1"].Captures.Count );
Console.WriteLine( "Cond2 matched {0} times.",
                   l_match.Groups["Cond2"].Captures.Count );
Console.WriteLine( "Cond3 matched {0} times.",
                   l_match.Groups["Cond3"].Captures.Count );

Console.ReadKey( true );

Regex regexObj = new Regex("Begin|Middle|End");
allMatchResults = regexObj.Matches(subjectString);
numberOfMatches = allMatchResults.Count