gistfile1.txt

		{	name = 'area.dbg.marker.pagebout.js';
			begin = '^(//)(#dbg)\s*$';
			end = '^(//)(\2)\s*$';
			beginCaptures = {
				1 = { name = 'comment.line.punctuation.definition.comment.js'; };
				2 = { name = 'active.dbg.token.open.pagebout.comment.line.js'; };
			};
			endCaptures = {
				1 = { name = 'comment.line.punctuation.definition.comment.js'; };
				2 = { name = 'active.dbg.token.close.pagebout.comment.line.js'; };
			};
			patterns = (
				{	name = 'active.dbg.marker.pagebout.js';
					begin = '^(?=.*//#dbg\s*$)';
					end = '(//)(#dbg)\s*$\n';
					endCaptures = {
						1 = { name = 'comment.line.punctuation.definition.comment.js'; };
						2 = { name = 'active.dbg.token.mark.pagebout.comment.line.js'; };
					};
					patterns = (
						{	include = 'source.js.jquery'; },
						{	include = 'source.js'; },
					);
				},
				{	include = '$self'; },
			);
		},

gistfile2.txt

some javascript line //#dbg <- not match

//#dbg <- opening #dbg block
some line //#dbg <- match, we are in opened #dbg block
other line //#xxx <- not match, we are not in opened #xxx block
//#dbg <- closing block

this line should not match //#dbg <- not match, not in open #dbg block

//#dbg <- and openging again
//#xxx <- opening xxx block inside dbg block
line1 //#dbg <- match 
line2 //#xxx <- match
line3 //#other <- not match
//#xxx <- closing
//#dbg <-closing