cperl-after-expr-p is a compiled Lisp function in `cperl-mode.el'.

(cperl-after-expr-p &optional LIM CHARS TEST)

Return true if the position is good for start of expression.
TEST is the expression to evaluate at the found position. If absent,
CHARS is a string that contains good characters to have before us (however,
`}' is treated "smartly" if it is not in the list).