sql queries for find-replace

Running some sql queries on our pgsql db like

UPDATE "file_id" SET "download_filename" = '-' 
WHERE "filename" ~~ 'SV_MS%' 
AND "filename" not like '%MSANTAN%'

UPDATE "file_id" SET "download_filename" = 
REPLACE(download_filename,'_RAVI_', '_') 
WHERE "filename" ~~ 'MBV%RAVI%' 
and filename not like '%ARAVIND%' 
and filename not like '%KULA%'

and so on. It took two mornings to finish.