Add support for ACCEPT verb.

include/boost/regex/v4/basic_regex_parser.hpp

@@ -2715,8 +2715,32 @@ bool basic_regex_parser<charT, traits>::parse_perl_verb()
          this->append_state(syntax_element_fail);
          return true;
       }
+      break;
+   case 'A':
+      if(++m_position == m_end)
+      {
+         // Rewind to start of (* sequence:
+         --m_position;
+         while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position;
+         fail(regex_constants::error_perl_extension, m_position - m_base);
          return false;
       }
+      if(match_verb("CCEPT"))
+      {
+         if((m_position == m_end) || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark))
+         {
+            // Rewind to start of (* sequence:
+            --m_position;
+            while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position;
+            fail(regex_constants::error_perl_extension, m_position - m_base);
+            return false;
+         }
+         ++m_position;
+         this->append_state(syntax_element_accept);
+         return true;
+      }
+      break;
+   }
    return false;
 }
 

include/boost/regex/v4/perl_matcher.hpp

@@ -444,6 +444,7 @@ private:
 #endif
    bool match_recursion();
    bool match_fail();
+   bool match_accept();
 
    // find procs stored in s_find_vtable:
    bool find_restart_any();

include/boost/regex/v4/perl_matcher_common.hpp

@@ -800,6 +800,20 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_fail()
    return false;
 }
 
+template <class BidiIterator, class Allocator, class traits>
+bool perl_matcher<BidiIterator, Allocator, traits>::match_accept()
+{
+   // Almost the same as match_match, but we need to close any half-open capturing groups:
+   for(unsigned i = 1; i < m_result.size(); ++i)
+   {
+      if((m_result[i].matched == false) && (m_result[i].first != last))
+      {
+         m_result.set_second(position, i);
+      }
+   }
+   return match_match();
+}
+
 
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_any()

include/boost/regex/v4/perl_matcher_non_recursive.hpp

@@ -141,7 +141,7 @@ struct saved_recursion : public saved_state
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
 {
-   static matcher_proc_type const s_match_vtable[31] = 
+   static matcher_proc_type const s_match_vtable[32] = 
    {
       (&perl_matcher<BidiIterator, Allocator, traits>::match_startmark),
       &perl_matcher<BidiIterator, Allocator, traits>::match_endmark,
@@ -178,6 +178,7 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
       &perl_matcher<BidiIterator, Allocator, traits>::match_toggle_case,
       &perl_matcher<BidiIterator, Allocator, traits>::match_recursion,
       &perl_matcher<BidiIterator, Allocator, traits>::match_fail,
+      &perl_matcher<BidiIterator, Allocator, traits>::match_accept,
    };
 
    push_recursion_stopper();

include/boost/regex/v4/perl_matcher_recursive.hpp

@@ -60,7 +60,7 @@ public:
 template <class BidiIterator, class Allocator, class traits>
 bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
 {
-   static matcher_proc_type const s_match_vtable[31] = 
+   static matcher_proc_type const s_match_vtable[32] = 
    {
       (&perl_matcher<BidiIterator, Allocator, traits>::match_startmark),
       &perl_matcher<BidiIterator, Allocator, traits>::match_endmark,
@@ -97,6 +97,7 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
       &perl_matcher<BidiIterator, Allocator, traits>::match_toggle_case,
       &perl_matcher<BidiIterator, Allocator, traits>::match_recursion,
       &perl_matcher<BidiIterator, Allocator, traits>::match_fail,
+      &perl_matcher<BidiIterator, Allocator, traits>::match_accept,
    };
 
    if(state_count > max_state_count)

include/boost/regex/v4/states.hpp

@@ -123,6 +123,7 @@ enum syntax_element_type
    syntax_element_recurse = syntax_element_toggle_case + 1,
    // Verbs:
    syntax_element_fail = syntax_element_recurse + 1,
+   syntax_element_accept = syntax_element_fail + 1,
 };
 
 #ifdef BOOST_REGEX_DEBUG

test/regress/test_perl_ex.cpp

@@ -939,4 +939,6 @@ void test_verbs()
    TEST_INVALID_REGEX("a+(*", perl);
    TEST_INVALID_REGEX("a+(*FX)", perl);
    TEST_REGEX_SEARCH("a+(*FAIL)b", perl, "aaaab", match_default, make_array(-2, -2));
+   TEST_REGEX_SEARCH("(A(A|B(*ACCEPT)|C)D)(E)", perl, "AB", match_default, make_array(0, 2, 0, 2, 1, 2, -1, -1, -2, -2));
+   TEST_REGEX_SEARCH("(A(A|B(*ACCEPT)|C)D)(E)", perl, "ACDE", match_default, make_array(0, 4, 0, 3, 1, 2, 3, 4, -2, -2));
 }