diff options
Diffstat (limited to 'src/theory/strings/regexp_operation.cpp')
| -rw-r--r-- | src/theory/strings/regexp_operation.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/theory/strings/regexp_operation.cpp b/src/theory/strings/regexp_operation.cpp index 061b1adb5..8d107d36a 100644 --- a/src/theory/strings/regexp_operation.cpp +++ b/src/theory/strings/regexp_operation.cpp @@ -1131,11 +1131,13 @@ void RegExpOpr::simplifyPRegExp( Node s, Node r, std::vector< Node > &new_nodes conc = s.eqNode( r[0] ); if(r[0] != r[1]) { unsigned char a = r[0].getConst<String>().getFirstChar(); + unsigned char b = r[1].getConst<String>().getFirstChar(); a += 1; - Node tmp = NodeManager::currentNM()->mkNode(kind::STRING_IN_REGEXP, s, + Node tmp = a!=b? NodeManager::currentNM()->mkNode(kind::STRING_IN_REGEXP, s, NodeManager::currentNM()->mkNode(kind::REGEXP_RANGE, NodeManager::currentNM()->mkConst( CVC4::String(a) ), - r[1])); + r[1])) : + s.eqNode(r[1]); conc = NodeManager::currentNM()->mkNode(kind::OR, conc, tmp); } /* |