vi, search string and comment line howto?

Hello, I can't figure out the syntax to search for a certain string and then
comment out that line. I know you can have multiple commands on a single
line, but I can't figure it out. As an example I have a "file" with the
following contents:

line 1 and stuff
line 2 contains my_string
line 2 and stuff

Now I want to vi the "file" and comment out the line containing "my_string"
by running the following commands:
vi file #to start editing "file"
/my_string #to search for the line I want to comment, containing
"my_string"
I# #to append a comment (#) to the beginning of the
current line
:wq #to write and quit

I should be able to string all the above commands together separated by a
pipe:
vi -c "/my_string | I# | :wq" file #give all the editing
commands to vi on the command line

vi file
/my_string | I# | :wq #or open the file in
vi and then enter the commands

but the above fails with: E486: Pattern not found: my_string | I# | wq

so, what am I doing wrong, anyone know how to accomplish searching for a
particular string and then comment out the line that it's on? Thanks.

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