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Sed, insert string to the beginning of a line

Hello,
I would need to add a specific string to the beginning of every line in a document which contains an other specific string, by using Sed or Awk.
I've tried my best to figure out this myself by using examples and tutorials, but I cant find any documentation about this. I did find out how to add something to the beginning of every line (s/^.*/text-to-add/ ), but I didn't manage to convert that so that it would work as i need it.

Ie. If a line contains the string <AB>, i would like to add a the text 'CDE' to the very beginning of that same line.

Im using Sed for Windows, but I asume the commands are almost the same as for Linux.

Thank you in advance,
Ken2

awk solution:

awk ' {if(/AB/) 

       { print "CDE" $0} 

       else 

         {print $0}

       } ' filename

filename contents:

AB

PDQ

PLMAB

output from awk:

CDEAB

PDQ

CDEPLMAB

Thank you very much :)