ack regex logical OR

I want to ignore the file if the filename match any of these words : copy, cony, coby OR tool, trol, thol etc. This one works : ack -l -i --ignore-file=match:/co.y/ --ignore-file=match:/t.ol/ "mystring" _mynukelib But i want to use single --ignore parameter. I tried to use "|" to create "OR" logic like in normal regex but doesn't work : ack -l -i --ignore-file=match:/co.y|t.ol/ "mystring" _mynukelib What is the proper syntax to perform logical OR.