Get the index field from a regex-group.
(regex-group->index x) → fty::x.name
This is an ordinary field accessor created by defprod.
Function:
(defun regex-group->index$inline (x) (declare (xargs :guard (regex-p x))) (declare (xargs :guard (equal (regex-kind x) :group))) (let ((__function__ 'regex-group->index)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and (equal (regex-kind x) :group) x))) (std::da-nth 1 (cdr x))) :exec (std::da-nth 1 (cdr x)))))
Theorem:
(defthm regex-group->index$inline-of-regex-fix-x (equal (regex-group->index$inline (regex-fix x)) (regex-group->index$inline x)))
Theorem:
(defthm regex-group->index$inline-regex-equiv-congruence-on-x (implies (regex-equiv x x-equiv) (equal (regex-group->index$inline x) (regex-group->index$inline x-equiv))) :rule-classes :congruence)
Theorem:
(defthm regex-group->index-when-wrong-kind (implies (not (equal (regex-kind x) :group)) (equal (regex-group->index x) nil)))