ADD CONTAINS

[xinity]

No description provided.

[l0rd]

This PR include also the commits of PR #6. Can you please rebase this branch with master ?

[xinity]

almost finished :)
need to get ride of "grep -q ! " instead of "! grep -q" and will be fine

[l0rd]

Great! Thanks @xinity

[xinity]

all right, all fixed except i haven't found how to get rid of "grep -q !" to make it "! grep -q''

i'll update this PR anyway, if you have any clues please let me know.

sorry not having not enough GO skills :(

[l0rd]

No problem for the grep -q ! I will fix it in a separate commit. Thanks for your contribution @xinity!