Bug

- When rc.regex:on is set, filters with "+tag" elements were causing
  a segfault because the "tag" word was converted to a non-capturing
  regex, no results were captured, and array[0] failed.  Now it is
  implemented that tag elements in a filter never use regexes, which
  maintains the idea the tags are not really words, but tokens that
  either match or don't.

src/Att.cpp

@@ -779,7 +779,7 @@ bool Att::match (const Att& other) const
   // word = contains as a substring, with word boundaries.
   else if (mMod == "word") // TODO i18n
   {
-    if (regex)
+    if (regex && other.mName != "tags")
     {
       std::vector <int> start;
       std::vector <int> end;
@@ -811,7 +811,7 @@ bool Att::match (const Att& other) const
   // noword = does not contain as a substring, with word boundaries.
   else if (mMod == "noword") // TODO i18n
   {
-    if (regex)
+    if (regex && other.mName != "tags")
     {
       std::vector <int> start;
       std::vector <int> end;