semantic-flex-extensions

semantic-flex-extensions is a variable defined in `lex.el'.
Its value is

nil

• Automatically becomes buffer-local when set.

Documentation:
Buffer local extensions to the lexical analyzer.
This should contain an alist with a key of a regex and a data element of
a function. The function should both move point, and return a lexical
token of the form:
( TYPE START . END)
nil is also a valid return value.
TYPE can be any type of symbol, as long as it doesn't occur as a
nonterminal in the language definition.