ctags

--langdef=Scala
--langmap=Scala:.scala
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*trait[ \t]+([a-zA-Z0-9_]+)/\4/t,traits/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*class[ \t]+([a-zA-Z0-9_]+)/\4/c,classes/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*case class[ \t]+([a-zA-Z0-9_]+)/\4/c,case classes/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*object[ \t]+([a-zA-Z0-9_]+)/\4/o,objects/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*case object[ \t]+([a-zA-Z0-9_]+)/\4/o,case objects/
--regex-scala=/^[ \t]*type[ \t]+([a-zA-Z0-9_]+)/\1/T,types/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*def[ \t]+([a-zA-Z0-9_]+)/\4/m,methods/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*val[ \t]+([a-zA-Z0-9_]+)/\4/l,constants/
--regex-scala=/^[ \t]*((abstract|final|sealed|implicit|lazy)[ \t]*)*(private|protected)?[ \t]*var[ \t]+([a-zA-Z0-9_]+)/\4/l,variables/
--regex-scala=/^[ \t]*package[ \t]+([a-zA-Z0-9_.]+)/\1/p,packages/

--langdef=NPL
--langmap=NPL:.npl
--regex-npl=/^[ \t]+([^ ]+)[ \t]*{/\1/c,class/
--regex-npl=/^[ \t]*def[ \t]+([A-Z0-9_-]+).*$/\1/m,method/