Use verbose option for regex to lay it out with comments so not

utterly cryptic

noinfo/prospecting_guide_scripts/make-prospectingguide-new.py

@@ -345,8 +345,16 @@ for fnm in ("../all.3d", "../alltracks.3d"):
 		draw = draws[mapcode]
 		lastx, lasty = 0, 0
 		for l in file3d:
-			match = re.match(r'^(MOVE|LINE|NODE)\s+(-?[0-9.]+)\s+(-?[0-9.]+)\s+(-?[0-9.]+)(?:\s+\[(\S*)\])*(?:\s+(.*))*$', l)
-#oldregex		match = re.match(r'^(MOVE|LINE|NODE)\s+(-?[0-9.]+)\s+(-?[0-9.]+)\s+(-?[0-9.]+)\s+(?:[^[]*\[(.*)\] ?([^]]*)$)?', l)
+			match = re.match(r'''
+			                  ^                 #start
+					  (MOVE|LINE|NODE)   #command type
+					  \s+(-?[0-9.]+)     #X-co-ord
+					  \s+(-?[0-9.]+)     #Y-co-ord
+					  \s+(-?[0-9.]+)     #altitude
+					  (?:\s+\[(\S*)\])*  #node name inside []
+					  (?:\s+(.*))*       #all optional flags
+					  $                  #till the end of the line
+					  ''', l, re.VERBOSE)
 			if not match: 
 				continue