Fix regex to find version on OS X
Fix regex to find version on OS X

EmreAtes/spack,TheTimmy/spack,krafczyk/spack,matthiasdiener/spack,skosukhin/spack,TheTimmy/spack,iulian787/spack,iulian787/spack,EmreAtes/spack,matthiasdiener/spack,krafczyk/spack,LLNL/spack,lgarren/spack,LLNL/spack,krafczyk/spack,skosukhin/spack,EmreAtes/spack,tmerrick1/spack,tmerrick1/spack,skosukhin/spack,iulian787/spack,krafczyk/spack,tmerrick1/spack,lgarren/spack,mfherbst/spack,iulian787/spack,matthiasdiener/spack,TheTimmy/spack,tmerrick1/spack,LLNL/spack,mfherbst/spack,lgarren/spack,matthiasdiener/spack,lgarren/spack,EmreAtes/spack,tmerrick1/spack,skosukhin/spack,LLNL/spack,lgarren/spack,iulian787/spack,EmreAtes/spack,skosukhin/spack,mfherbst/spack,TheTimmy/spack,LLNL/spack,matthiasdiener/spack,krafczyk/spack,mfherbst/spack,TheTimmy/spack,mfherbst/spack