Fix regex to not match empty string (HTCONDOR-598)
Fix regex to not match empty string (HTCONDOR-598)

brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce