Replace egrep with grep -E

[dracorp]

Description

This change replace egrep with grep -E.

Motivation and Context

To prevent a warning:

egrep: warning: egrep is obsolescent; using grep -E

How Has This Been Tested?

None

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] If my change requires a change to the documentation, I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• [ ] I have added tests to cover my changes, and all the new and existing tests pass.

[davidpfarrell]

Hi ! Thanks for taking the time and effort to make bash-it better !

Wondering if you've seen my similar PR:

• https://github.com/Bash-it/bash-it/pull/2164

And this discussion on the egrep fiasco:

• https://github.com/Bash-it/bash-it/issues/2163

I'll try to take a pass and see if you caught anything I missed in my PR.

Thanks again !

-Dave

[davidpfarrell]

OK I compared the two PRs and I think my PR captures all of these changes, and a few others ...

[dracorp]

@davidpfarrell Yes, I agree. Thanks.