lib: handle empty string in regexp field processors

[notmuch] / lib / regexp-fields.cc

diff --git a/lib/regexp-fields.cc b/lib/regexp-fields.cc
index 9dcf973263743ea01721bf139569cafa17577943..1651677cd8638b759a9f96838237a98aa2ef5af2 100644 (file)
--- a/lib/regexp-fields.cc
+++ b/lib/regexp-fields.cc
@@ -148,6 +148,11 @@ RegexpFieldProcessor::RegexpFieldProcessor (std::string prefix, Xapian::QueryPar
 Xapian::Query
 RegexpFieldProcessor::operator() (const std::string & str)
 {
+    if (str.size () == 0)
+       return Xapian::Query(Xapian::Query::OP_AND_NOT,
+                            Xapian::Query::MatchAll,
+                            Xapian::Query (Xapian::Query::OP_WILDCARD, term_prefix));
+
     if (str.at (0) == '/') {
        if (str.at (str.size () - 1) == '/'){
            RegexpPostingSource *postings = new RegexpPostingSource (slot, str.substr(1,str.size () - 2));