From: Antonio Ospite <ao2@ao2.it>
Date: Fri, 29 Jul 2016 14:07:07 +0000 (+0200)
Subject: open_wrapper.sh: make the wrapper script POSIX shell compliant
X-Git-Url: https://git.ao2.it/conversations_http_downloader.git/commitdiff_plain/ddc6d336faa0901fd33cf9de30daaf670c53d68b?hp=ddc6d336faa0901fd33cf9de30daaf670c53d68b

open_wrapper.sh: make the wrapper script POSIX shell compliant

Running open_wrapper.sh was failing with some shells different from
bash, because they don't support substring expansion.

For example, dash was giving this error:

  ./open_wrapper.sh: 35: ./open_wrapper.sh: Bad substitution

While fixing the issue also use a stricter check for the URL: the anchor
should only contain hex digits.
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