I use Jenkins' view function to group my jobs. But I'm not sure do I lost any job. Is it possible to find the job which not belongs to any view? Or is it possible to find any job belongs to 2 views?
To avoid this mess, I use regular expressions to assign jobs to view and a naming convention for the jobs. Everything else would be hit and miss.
In addition, a job will not show up in a view if you don't have permission for the job.