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fix and optimize not-contains and regex equalities

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-04-21 09:16:00 +02:00
parent c18188cba8
commit 352b14fe2b
4 changed files with 86 additions and 42 deletions
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12
src/ast/rewriter/seq_axioms.cpp
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@ -1353,11 +1353,23 @@ namespace seq {
Create the recursive function not_contains that implements this recursive definition.
Add the axiom
contains(a, b) or not_contains(a, b)
if b is a string (or concatentation of characters/unit values) use regex shortcut:
~contain(a, b) => a not in .*b.*
*/
void axioms::not_contains_axiom(expr *e) {
expr* _a = nullptr, *_b = nullptr;
VERIFY(seq.str.is_contains(e, _a, _b));
if (seq.str.is_string(_b)) {
auto star = seq.re.mk_full_seq(seq.re.mk_re(_b->get_sort()));
auto b_re = seq.re.mk_to_re(_b);
auto r = seq.re.mk_concat(star, seq.re.mk_concat(b_re, star));
auto mem = seq.re.mk_in_re(_a, r);
add_clause(expr_ref(e, m), ~expr_ref(mem, m));
return;
}
auto ca = purify(_a);
auto cb = purify(_b);
sort* srt = ca->get_sort();