further tidying and documenting of the main 3ddump file regexp

noinfo/prospecting_guide_scripts/make-prospectingguide-new.py

@@ -347,13 +347,21 @@ for fnm in ("../all.3d", "../alltracks.3d"):
 		for l in file3d:
 			match = re.match(r'''
 			                  ^                 #start
-					  (MOVE|LINE|NODE)   #command type
+					  (MOVE|LINE|NODE)   #one of three command types
 					  \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
+					  (?:                #grouping without saving result - for station name
+					    \s+              #at least one space
+					    \[               #opening [
+					    (\S*)            #the station name we want to save
+					    \]               #closing ]
+					  )?                 #end of optional station name group
+					  (?:                #grouping without saving result - for flags
+					    \s+              #at least one space separating from [station]
+					    (.*)             #all the flags, including spaces
+					  )?                 #end of optional flags group
+					  $                  #end of the line
 					  ''', l, re.VERBOSE)
 			if not match: 
 				continue