...
SUBSTRING (call_number,'\d{1,}\.{0,}\d{0,}') AS lc_class_number*
SUBSTRING (call_number, '\.[A-Z][0-9]{1,}') AS first_cutter
...
...
SUBSTRING (call_number,'\d{1,}\.{0,}\d{0,}') AS lc_class_number*
SUBSTRING (call_number, '\.[A-Z][0-9]{1,}') AS first_cutter
...