Description of problem:
Aesh grep command doesn't return expected result. The same command with bash grep gives 'nofork' result.

Actual results:
[standalone@embedded /] echo nofork | grep '^no(fork|group)'
[standalone@embedded /]

Expected results:
[standalone@embedded /] echo nofork | grep '^no(fork|group)'
[standalone@embedded /] nofork