Jenkins Role-based Auth plugin : Jobs sub directory regex match
I also had the same issue. You need to use the following regexp: projectv1.0|projectv1.0/demo|projectv1.0/demo/dev1.0.*
more detailed info is available at https://issues.jenkins-ci.org/browse/JENKINS-24767 (second comment)
Using the Jenkins Role-based Authorization Strategy plugin you can restrict access to only jobs under projectv1.0/demo/dev1.0 folder adding a «Item Role» with the following pattern:
projectv1.0(/demo(/dev1.0(/.*)?)?)?