how to make grep ignore special characters

usually i use grep to search long *man* pages for certain options rather than going through the whole manual..however when i need to view the part related to certain option, grep interprets that option as its own which causes unexpected behaviour or displaying available options for grep..for instance i need to check what -r exactly does in *userdel* as in

man userdel | grep -r

now grep modifies its behaviour accordingly, but i need it to search for -r in the man page instead..

man grep | grep exact

ddnt really help :) any suggestions ??

man userdel | grep -- -r

or

man userdel | grep -A 10 -- -r

-A NUM, --after-context=NUM Print NUM lines of trailing context after matching lines. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.

thx, this solves the problem. now how can i search for a sequence of words, like

man grep | grep "end options"

preferably case insensitive search

 man grep | grep -i -A 3 -- "--IgnorE-CasE"

I hope this will work:

man userdel | grep '\-r'

thx guys..u rock :guitar: