("^[-_+ ]?\\(cvs\\|git\\|bzr\\|svn\\|hg\\|darcs\\)$" . -4)
("^[-_+ ]?alpha$" . -3)
("^[-_+ ]?beta$" . -2)
- ("^[-_+ ]?\\(pre\\|rcc\\)$" . -1))
+ ("^[-_+ ]?\\(pre\\|rc\\)$" . -1))
"Specify association between non-numeric version and its priority.
This association is used to handle version string like \"1.0pre2\",