busybox/shell/ash_test/ash-vars/var_bash4.tests

FOO='a*b\*c'
BAR=${FOO//\\*/-backslashstar-}
echo In assignment: "$BAR"
echo Unquoted: ${FOO//\\*/-backslashstar-}
echo Quoted: "${FOO//\\*/-backslashstar-}"
echo Done: $?