Extending sed's exit codes functionality

[Seeker]

I've came to an idea, to completely ditch grep in favor of sed.
Mainly because of this!

And especially, because I simply have a more power, at the hand, with sed.

To my horror, I've figured out that, sed returns exit code 0, upon MATCH and NO_MATCH (grep obeys these)
It will return 0>, only if it receives wrong regex or non existant file.

This makes me unable to use sed in i.e; bourne's 'if' statement

# Replaces 'grep -Eq ...' -> quiet
if eval "echo \"\$$container\"" | sed -En "/$sep$part$sep/q"; then
    echo 'I ALWAYS get executed'
else
    echo 'It is sed's fault, I NEVER get executed'
fi

I want to request devs, to extend sed's exit codes functionality, so it could differentiate between MATCH and NO_MATCH, or as sed has functions, which affects matching patterns:
F_APPLIED and F_NOT_APPLIED

 

[gordon@]

According to the Single Unix Specification (http://www.unix.org/single_unix_specification/), exit status for sed(1) is as follows:

0 -- Successful completion.
>0 -- An error occurred.

Sed is a stream editor, not a matching program. That said, you could probably do the entire if block in sed, but that's an exercise for the reader.

I would fix your problems with grep.