s/"\([^"]*\)"/“\1”/g
s/`\([^`']*\)'/‘\1’/g
s/ '\([^`']*\)' / ‘\1’ /g
s/ '\([^`']*\)'$/ ‘\1’/g
s/^'\([^`']*\)' /‘\1’ /g
s/“”/""/g
s/“/“/g
s/”/”/g
s/‘/‘/g
s/’/’/g