diff --git a/doc/history.qbk b/doc/history.qbk
index 168fdf2a..f83aef93 100644
--- a/doc/history.qbk
+++ b/doc/history.qbk
@@ -15,6 +15,10 @@ Currently open issues can be viewed [@https://svn.boost.org/trac/boost/query?sta
 
 All issues including closed ones can be viewed [@https://svn.boost.org/trac/boost/query?status=assigned&status=closed&status=new&status=reopened&component=regex&order=priority&col=id&col=summary&col=status&col=type&col=milestone&col=component here].
 
+[h4 Boost-1.50]
+
+Fixed issue with `(?!)` not being a valid expression, and updated docs on what constitutes a valid conditional expression.
+
 [h4 Boost-1.48]
 
 Fixed issues:
diff --git a/doc/html/boost_regex/background_information.html b/doc/html/boost_regex/background_information.html
index ccd9ff3a..1b0b2063 100644
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 </div>
-<div class="section">
+<div class="section boost_regex_background_information">
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 </div>
-<div class="section">
+<div class="section boost_regex_background_information_acknowledgements">
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+      </h5>
+<p>
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+<h5>
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+<div class="section boost_regex_syntax_collating_names_named_unicode">
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+<div class="section boost_regex_syntax_collating_names_posix_symbolic_names">
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 <a name="boost_regex.syntax.collating_names.posix_symbolic_names"></a><a class="link" href="posix_symbolic_names.html" title="POSIX Symbolic Names">POSIX
         Symbolic Names</a>
diff --git a/doc/html/boost_regex/syntax/leftmost_longest_rule.html b/doc/html/boost_regex/syntax/leftmost_longest_rule.html
index a801237c..a215562b 100644
--- a/doc/html/boost_regex/syntax/leftmost_longest_rule.html
+++ b/doc/html/boost_regex/syntax/leftmost_longest_rule.html
@@ -22,7 +22,7 @@
 <div class="spirit-nav">
 <a accesskey="p" href="collating_names/named_unicode.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../syntax.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../format.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
 </div>
-<div class="section">
+<div class="section boost_regex_syntax_leftmost_longest_rule">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="boost_regex.syntax.leftmost_longest_rule"></a><a class="link" href="leftmost_longest_rule.html" title="The Leftmost Longest Rule">The Leftmost
       Longest Rule</a>
diff --git a/doc/html/boost_regex/syntax/perl_syntax.html b/doc/html/boost_regex/syntax/perl_syntax.html
index 2ba0eaf0..f7dbf246 100644
--- a/doc/html/boost_regex/syntax/perl_syntax.html
+++ b/doc/html/boost_regex/syntax/perl_syntax.html
@@ -22,7 +22,7 @@
 <div class="spirit-nav">
 <a accesskey="p" href="../syntax.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../syntax.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="basic_extended.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
 </div>
-<div class="section">
+<div class="section boost_regex_syntax_perl_syntax">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="boost_regex.syntax.perl_syntax"></a><a class="link" href="perl_syntax.html" title="Perl Regular Expression Syntax">Perl Regular Expression
       Syntax</a>
@@ -1292,7 +1292,8 @@
       </p>
 <p>
         <code class="literal">(?(condition)yes-pattern)</code> attempts to match <span class="emphasis"><em>yes-pattern</em></span>
-        if the <span class="emphasis"><em>condition</em></span> is true, otherwise fails.
+        if the <span class="emphasis"><em>condition</em></span> is true, otherwise matches the NULL
+        string.
       </p>
 <p>
         <span class="emphasis"><em>condition</em></span> may be either: a forward lookahead assert,
@@ -1313,6 +1314,21 @@
             if the forward look-ahead assert does not match, otherwise executes
             <span class="emphasis"><em>no-pattern</em></span>.
           </li>
+<li class="listitem">
+            =(?(<span class="emphasis"><em>N</em></span>)yes-pattern|no-pattern)= Executes <span class="emphasis"><em>yes-pattern</em></span>
+            if subexpression <span class="emphasis"><em>N</em></span> has been matched, otherwise executes
+            <span class="emphasis"><em>no-pattern</em></span>.
+          </li>
+<li class="listitem">
+            =(?(&lt;<span class="emphasis"><em>name</em></span>&gt;)yes-pattern|no-pattern)= Executes
+            <span class="emphasis"><em>yes-pattern</em></span> if named subexpression <span class="emphasis"><em>name</em></span>
+            has been matched, otherwise executes <span class="emphasis"><em>no-pattern</em></span>.
+          </li>
+<li class="listitem">
+            =(?('<span class="emphasis"><em>name</em></span>')yes-pattern|no-pattern)= Executes <span class="emphasis"><em>yes-pattern</em></span>
+            if named subexpression <span class="emphasis"><em>name</em></span> has been matched, otherwise
+            executes <span class="emphasis"><em>no-pattern</em></span>.
+          </li>
 <li class="listitem">
             <code class="literal">(?(R)yes-pattern|no-pattern)</code> Executes <span class="emphasis"><em>yes-pattern</em></span>
             if we are executing inside a recursion, otherwise executes <span class="emphasis"><em>no-pattern</em></span>.
@@ -1323,6 +1339,12 @@
             a recursion to sub-expression <span class="emphasis"><em>N</em></span>, otherwise executes
             <span class="emphasis"><em>no-pattern</em></span>.
           </li>
+<li class="listitem">
+            <code class="literal">(?(R&amp;<span class="emphasis"><em>name</em></span>)yes-pattern|no-pattern)</code>
+            Executes <span class="emphasis"><em>yes-pattern</em></span> if we are executing inside
+            a recursion to named sub-expression <span class="emphasis"><em>name</em></span>, otherwise
+            executes <span class="emphasis"><em>no-pattern</em></span>.
+          </li>
 <li class="listitem">
             <code class="literal">(?(DEFINE)never-exectuted-pattern)</code> Defines a block
             of code that is never executed and matches no characters: this is usually
diff --git a/doc/html/boost_regex/unicode.html b/doc/html/boost_regex/unicode.html
index 03c08b37..b8af3f00 100644
--- a/doc/html/boost_regex/unicode.html
+++ b/doc/html/boost_regex/unicode.html
@@ -22,7 +22,7 @@
 <div class="spirit-nav">
 <a accesskey="p" href="introduction_and_overview.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="captures.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
 </div>
-<div class="section">
+<div class="section boost_regex_unicode">
 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 <a name="boost_regex.unicode"></a><a class="link" href="unicode.html" title="Unicode and Boost.Regex">Unicode and Boost.Regex</a>
 </h2></div></div></div>
diff --git a/doc/html/index.html b/doc/html/index.html
index ab6d8354..022c6327 100644
--- a/doc/html/index.html
+++ b/doc/html/index.html
@@ -198,7 +198,7 @@
   </p>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: December 24, 2011 at 18:02:12 GMT</small></p></td>
+<td align="left"><p><small>Last revised: March 28, 2012 at 11:56:40 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>
diff --git a/doc/syntax_perl.qbk b/doc/syntax_perl.qbk
index 21d873b6..fc412ebb 100644
--- a/doc/syntax_perl.qbk
+++ b/doc/syntax_perl.qbk
@@ -531,7 +531,7 @@ and =(?+1)= recurses to the next sub-expression to be declared.
 the /condition/ is true, otherwise attempts to match /no-pattern/.
 
 =(?(condition)yes-pattern)= attempts to match /yes-pattern/ if the /condition/ 
-is true, otherwise fails.
+is true, otherwise matches the NULL string.
 
 /condition/ may be either: a forward lookahead assert, the index of 
 a marked sub-expression (the condition becomes true if the sub-expression 
@@ -544,10 +544,18 @@ Here is a summary of the possible predicates:
 executes /no-pattern/.
 * =(?(?!assert)yes-pattern|no-pattern)=  Executes /yes-pattern/ if the forward look-ahead assert does not match, otherwise
 executes /no-pattern/.
+* =(?(['N])yes-pattern|no-pattern)=  Executes /yes-pattern/ if subexpression /N/ has been matched, otherwise
+executes /no-pattern/.
+* =(?(<['name]>)yes-pattern|no-pattern)=  Executes /yes-pattern/ if named subexpression /name/ has been matched, otherwise
+executes /no-pattern/.
+* =(?('['name]')yes-pattern|no-pattern)=  Executes /yes-pattern/ if named subexpression /name/ has been matched, otherwise
+executes /no-pattern/.
 * =(?(R)yes-pattern|no-pattern)=  Executes /yes-pattern/ if we are executing inside a recursion, otherwise
 executes /no-pattern/.
 * [^(?(R['N])yes-pattern|no-pattern)]  Executes /yes-pattern/ if we are executing inside a recursion to sub-expression /N/, otherwise
 executes /no-pattern/.
+* [^(?(R&['name])yes-pattern|no-pattern)]  Executes /yes-pattern/ if we are executing inside a recursion to named sub-expression /name/, otherwise
+executes /no-pattern/.
 * [^(?(DEFINE)never-exectuted-pattern)]  Defines a block of code that is never executed and matches no characters:
 this is usually used to define one or more named sub-expressions which are refered to from elsewhere in the pattern.
 
diff --git a/include/boost/regex/v4/basic_regex_parser.hpp b/include/boost/regex/v4/basic_regex_parser.hpp
index f524673d..523f6786 100644
--- a/include/boost/regex/v4/basic_regex_parser.hpp
+++ b/include/boost/regex/v4/basic_regex_parser.hpp
@@ -2492,9 +2492,11 @@ option_group_jump:
       this->m_pdata->m_data.align();
       re_jump* jmp = static_cast<re_jump*>(this->getaddress(jump_offset));
       jmp->alt.i = this->m_pdata->m_data.size() - this->getoffset(jmp);
-      if(this->m_last_state == jmp)
+      if((this->m_last_state == jmp) && (markid != -2))
       {
-         // Oops... we didn't have anything inside the assertion:
+         // Oops... we didn't have anything inside the assertion.
+         // Note we don't get here for negated forward lookahead as (?!)
+         // does have some uses.
          // Rewind to start of (? sequence:
          --m_position;
          while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position;
diff --git a/test/regress/test_perl_ex.cpp b/test/regress/test_perl_ex.cpp
index 9e1ddd30..7745a258 100644
--- a/test/regress/test_perl_ex.cpp
+++ b/test/regress/test_perl_ex.cpp
@@ -134,6 +134,11 @@ void test_conditionals()
    TEST_INVALID_REGEX("(?<=*|\\B)", perl);
    TEST_INVALID_REGEX("(?<!a|bc)de", perl);
    TEST_INVALID_REGEX("(?<=a|bc)de", perl);
+
+   // Bug reports:
+   TEST_REGEX_SEARCH("\\b(?:(?:(one)|(two)|(three))(?:,|\\b)){3,}(?(1)|(?!))(?(2)|(?!))(?(3)|(?!))", perl, "one,two,two, one", match_default, make_array(-2, -2));
+   TEST_REGEX_SEARCH("\\b(?:(?:(one)|(two)|(three))(?:,|\\b)){3,}(?(1)|(?!))(?(2)|(?!))(?(3)|(?!))", perl, "one,three,two", match_default, make_array(0, 13, 0, 3, 10, 13, 4, 9, -2, -2));
+   TEST_REGEX_SEARCH("\\b(?:(?:(one)|(two)|(three))(?:,|\\b)){3,}(?(1)|(?!))(?(2)|(?!))(?(3)|(?!))", perl, "one,two,two,one,three,four", match_default, make_array(0, 22, 12, 15, 8, 11, 16, 21, -2, -2));
 }
 
 void test_options()