While it's not my own answer (taken and modified from and answer on this question), this may help with that you're looking for..
- This would give you any virtual matching that description
tmsh list ltm virtual | grep ''
(it's not the prettiest output but it gives you the whole config for that virtual) - This would give you the virtual name and description line:
tmsh list ltm virtual | awk '/(ltm virtual|)/' | grep -B1 ""
- This would give you a slightly cleaner version of the previous one
tmsh list ltm virtual | awk '/(ltm virtual|)/' | grep -B1 "" | sed -e 's/{//g;s/--//g;s/\n//g'