Variable: c-cpp-expr-intro-re
c-cpp-expr-intro-re is a buffer-local variable defined in
cc-engine.el.gz.
Documentation
Regexp which matches the start of a CPP directive which contains an expression, or nil if there aren't any in the language.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/cc-engine.el.gz