Some other variants: 
map { /^online.*svc:(.*?):/; $1 // () }
map { /^online.*svc:(.*?):/ and $1 or () }
map { /^online.*svc:(.*?):/ ? $1 : () }

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The latter two are easy to extend if there are multiple captures. (The middle one is my favourite.)

In reply to Re^3: Capturing regex from map by Anonymous Monk
in thread Capturing regex from map by trippledubs

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