+
+dbmeta_autogroup(){
+ sed -E '
+ # perform auto grouping if group id is missing or empty
+ /\r$/bAUTOGROUP; s;\r \\$;\r;; tAUTOGROUP;
+
+ # skip auto grouping if manual group id is present
+ /\r .+$/b;
+
+ :AUTOGROUP
+ # save original dataset
+ h;
+
+ # strip all fields but the name
+ s;^[^\t]+ [^\t]+ [^\t]+ [^\t]+ [^\t]+ ;;
+ # strip common suffixes of web video sites
+ s;-([0-9a-zA-Z_-]{11}|ph[0-9a-f]{13}|[0-9]{6,})\r$;-\r;;
+
+ # replace all numeric parts and append numerals to an ordering field
+ # the group id will be made up of only the non-numeric character frame
+ # the ordering field will hold all numbers from the name
+ :X s;^([^\r0-9]*)([0-9]+)([^\r0-9]*)\r\t?([0-9]*)$;\1\r\3\r \4\2;; tX;
+
+ # append group id and ordering field to dataset
+ H; g; s;\n;\t;;
+ ' "$@"
+}