simple gsub question \' \` what?

Sorry for the simple question, I just can't figure this out after a
couple hours...

I need to parse a string:

string = column-1:block-0,block-2,block-1,block-3

and I need to extract everything before the : (colon) into one variable
(should end up like this:
string1 = column-1

and then the rest of the string (block-0,block-2,block-1,block3) into an
array...

How can I use gsub to extract everything before the colon?

I've looked at the documentation and just can't understand how to use
the \` or \' syntax... I want the two new strings to be:

string1 = column-1
string2 = ["block-0", "block-2", "block-1", "block-3"]

I'm thinking it's something like this:

string.gsub(/:/, "\`")

really, I just don't get it...

the documentation that I'm looking at is here:
http://dev.rubycentral.com/ref/ref_c_string.html

thanks a bunch!
-Dustin

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