Replace deprecated egrep with grep -E

[tinder-ryantrontz]

This commit replaces the use of egrep with grep -E.

Motivation

When this project invokes egrep on a machine using GNU grep versions >= 3.8, a warning is printed to the console that egrep is obsolescent. This warning is interleaved with the in-progress terminal command, and creates an undesirable user experience. This is reproducible when a build is run (nearly-)immediately after the shell has initialized and the completion cache hasn't been populated.

Example output: This command intends to run a Gradle task on a subproject in the worker/ directory in a multi-project repo. When the user presses Tab after a few characters, this warning shows up and locks up the terminal for a few seconds.

❯ ./gradlew -p workegrep: warning: egrep is obsolescent; using ggrep -E
er/erating Gradle build script cache

Additional Background

• Officially, egrep and fgrep were marked as "not needed" and not part of the official POSIX standard in 2007.
• Starting with GNU grep 3.8, a warning is printed when egrep or fgrep invoked.
• GNU Grep Release Notes

The egrep and fgrep commands, which have been deprecated since release 2.5.3 (2007), now warn that they are obsolescent and should be replaced by grep -E and grep -F.

[tinder-ryantrontz]

Note: This is my first (of many I hope) contributions to the Gradle community. I tested these changes locally with bash and zsh, and the warning no longer shows up, and the completions still work correctly, both with project paths and directory paths. If there are any other testing steps or info needed on the PR, please feel free to let me know.

Thank you for reviewing this PR!

[alllex]

Thank you for your first and hopefully one of many contributions 😉

This looks good!