C# regular expression match pattern with indentation -

i have text file, , want match 3 lines occur 10 times within text file. problem match 3 lines indentation, , third line can words

line example:

    something           follow found           something  

this have tried far:

string pattern = @"\s\s\s\sthen([\s\s]*)found(\n|\r|\r\n)(\s\s\s\s\s\s)(.*)"; match = regex.match(input, pattern, regexoptions.multiline); 

the result gives me 500 matches, not im looking for.

i'm making wild guesses required format, can try this:

var text = @"    something       follow found       something       "; var pattern = @"[ ]{4}then[\w\s]+(\r|\n|\r\n)[ ]{6}[\w\s]+found(\r|\n|\r\n)[ ]{6}[\w\s]+(\r|\n|\r\n)"; var match = regex.match(text, pattern, regexoptions.multiline)