Hi guys
I have problem concerning bash programming
How can I search a multiline pattern in a file ( by "sed" or "grep" or ...)?
As far as I know these tools are line oriented, however "sed" gives the possibilty of multiline pattern,but I couldn't succeed in using it correctly.
Let me give you an example:
I want to search the following pattern in a file:

"Hello ! How are you?
I'm doing OK.
Wish you luck"

Note:These lines should follow each other without any extra lines between them.
And I want my search not to be case sensitive.

I would be so thankful if you show me the point

Sed the carriage returns into some non-used character (| or such) and grep -i "Hello ! How are you?" |grep -i "I'm doing OK" |grep -i "Wish you luck"

perl would be easier.