Segmentation question

I'm trying to force segmentation in xlz files which contain a lot of strings like this one:

...Joseph Lubin.[5] In 2014, 

where Trados doesn't seem to want to segment at the fullstop. I tried a pair of before and after segmentation rules like this:

.    .\[*\]

.\[*\]   .

but nothing seems to happen. Clearly I'm doing something wrong - again :) 

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