Doesn't work with Mac grep

[jsit]

The grep that comes with macOS is grep (BSD grep) 2.5.1-FreeBSD, which doesn't contain the -P flag, so searching tags fails.

To fix this I installed the Homebrew grep, which installs as ggrep, and then updated the lines that contain grep in tags.vim to ggrep. This seems to solve the issue for me (although triggers that contain hyphens are having problems).

Alternatively you could not use Perl grep in the plugin.

[normen]

+1 - this plugin is pretty much useless on MacOS in the current state