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simplify string patterns into prefix/suffix constraints

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2024-10-14 14:32:33 -07:00
parent 62478db7d5
commit 5993735b34
1 changed files with 9 additions and 0 deletions
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9
src/ast/rewriter/seq_rewriter.cpp
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@ -4541,6 +4541,15 @@ br_status seq_rewriter::mk_str_in_regexp(expr* a, expr* b, expr_ref& result) {
result = m_br.mk_eq_rw(a, b_s);
return BR_REWRITE_FULL;
}
expr* c = nullptr, *d = nullptr, *e = nullptr;
if (re().is_concat(b, c, d) && re().is_to_re(c, e) && re().is_full_seq(d)) {
result = str().mk_prefix(e, a);
return BR_REWRITE1;
}
if (re().is_concat(b, c, d) && re().is_to_re(d, e) && re().is_full_seq(c)) {
result = str().mk_suffix(e, a);
return BR_REWRITE1;
}
expr* b1 = nullptr;
expr* eps = nullptr;
if (re().is_opt(b, b1) ||