Question

I would like a regex pattern to match all lines in a text file that has the follow pattern:

TcQuery {dynamic_content} Alias "{dynamic_content}" New

If the text file has these two lines:

//tcquery c_query alias "qrybklog" new           <= This one shouldn´t be found because there is two backslashes before TcQuery.

tcquery c_query alias "qrybklog" new             <= I want a pattern to match this line

I´ve tried this but both lines are matched:

        var prw = System.IO.File.ReadAllText(@"d:\backlog.prw", Encoding.ASCII);

        prw = "//TcQuery c_query Alias teste1 new";
        prw = "\nTcQuery c_query Alias teste2 new";
        prw = "\nTcQuery c_query Alias teste3 new";
        prw = "\n//TcQuery c_query Alias teste4 new";
        var regexTcQuery = new Regex("TcQuery+[ *]+[0-9a-zA-Z_]+[ *]+alias+[ *]+[0-9a-zA-Z_\"]+[ *]new$", RegexOptions.IgnoreCase);

        var resultTcQuery = regexTcQuery.Matches(prw);

Answer 1

Use singleline and ignorecase option with this regex

(?<!\/\/)\s*?\btcquery\b(.*?)\balias\b.*?new

---

(?<!\/\/) checks for // before tcquery

.*? is a lazily matches 0 to many characters.If you use .* then it would match the last tcqurey skipping ibetween tcquery matches

\b is a non-word boundary.This allows us to match separate words

\s matches 0 to many space which can be any of the [\n\r\t\f]

---

If you want to get the c_query text you can do this

List<string> lst=Regex.Matches(input,@"(?<!\/\/)\s*?\btcquery\b(.*?)\balias\b.*?new").Cast<Match>().Select(x=>x.Groups[1].Value).ToList();