[Bug 10901] New: Shell parameter expansion not working for /

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10901

            Bug ID: 10901
           Summary: Shell parameter expansion not working for /
           Product: Busybox
           Version: 1.27.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: camabeh at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Hello, I am trying to escape varaible which will be used in `sed` command but
unfortunately it looks like there is some bug in handling parameter expansion
in busybox shell.

Expected:
> Bash in Ubuntu:
```sh
$ var="/Users/Documents/name/file"; echo "${var//\//\\/}"
\/Users\/Documents\/name\/file
```

Actual:
> Shell in Alpine:
```sh
$ var="/Users/Documents/name/file"; echo "${var//\//\\/}"
/Users/Documents/name/file
```

It's wierd because parameter expansion with replacement is working for other
characters.

> Bash in Ubuntu:
```sh
$ var="/Users/Documents/name/file"; echo "${var//e/E}"
/UsErs/DocumEnts/namE/filE
```
> Shell in Alpine:
```sh
$ var="/Users/Documents/name/file"; echo "${var//e/E}"
/UsErs/DocumEnts/namE/filE
```

Env:
BusyBox v1.27.2 (2017-11-28 16:17:30 GMT) multi-call binary.
Alpine 3.7

Ref:
https://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion

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