Add support Perl regexp instead of grep extended

[bubalush]

There is no way how to find changes with the following regexp:
^(?!test).*

[bubalush]

I suggest changing grep -i -E to grep -i -P

[roopakv]

@bubalush thank you for the issue, could you point to the command you are referring to?

[bubalush]

For example https://github.com/roopakv/orbs/blob/master/src/commands/trigger_pipeline_if_modified.yml#L73.
If you can change it everywhere in your orb, it will be great.

Grep extended regexp doesn't support all functions. grep -P is the same as pcregrep - a grep with Perl-compatible regular expressions.

I'm trying to find changes everywhere except test folder = ^(?!test).* to trigger the main workflow.

[roopakv]

@bubalush i think the one thing i want to look into is backward compatibility. otherwise i think should be ok

[bubalush]

Great, thanks in advance. I believe that it will bring more flexibility to your orbs.

[bubalush]

solved