1s/"\([^"]*\)"/“\1”/g 2s/`\([^`']*\)'/‘\1’/g 3s/ '\([^`']*\)' / ‘\1’ /g 4s/ '\([^`']*\)'$/ ‘\1’/g 5s/^'\([^`']*\)' /‘\1’ /g 6s/“”/""/g 7