'/tool/a/r/V2/V2DepCheck/1.109.2.1/V2DepCheck.pm'
'/tool/a/r/p4/r/main/V2/V2DepCheck/169441/V2DepCheck.pm'
'/tool/a/r/p4/r/branches/bd32b/V2/V2DepCheck/175507/V2DepCheck.pm'
'/home/me/cvs/V2/V2DepCheck.pm'
'/tool/a/r/boost/1.36.0'
'/tool/a/r/cadence/itk/itkvd/v007'

##</code><code>##

1.109.2.1
169441
175507
undef
1.36.0
007

##</code><code>##

$path =~ m#/tool/a/r/(?:p4/r/main/|p4/r/branches/.+/)?.*/\D?([0-9.]+)\b#