The comments in a sql file will be probably either at the start of the line with or without white spaces "^\s*--" or after a semicolon "\;\s*--". If I'm not wrong, this is not a valid sql sentence in most databases, thus you shouldn't have it: select '--foo' from mytable --bar
(And you shouldn't have tables with name fields beginning by "--")
Something like this should be enough to strip all comments from your file:
open my ORIGINALFILE, '<', 'file.sql' or die... etc
open my CLEANEDFILE, '>', outfile... etc, as usual
next if /^\s*--.*$/ ;
print CLEANEDFILE $_ ;
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