Added support for function objects as well as strings when formatting.

Updated and regenerated docs.

[SVN r57250]

doc/html/boost_regex/ref/regex_iterator.html

@@ -78,7 +78,7 @@
                           <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_default</span><span class="special">);</span>
 </pre>
 <a name="boost_regex.ref.regex_iterator.description"></a><h5>
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         <a class="link" href="regex_iterator.html#boost_regex.ref.regex_iterator.description">Description</a>
       </h5>
 <p>
@@ -436,7 +436,7 @@
         <span class="emphasis"><em>m</em></span>.
       </p>
 <a name="boost_regex.ref.regex_iterator.examples"></a><h5>
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         <a class="link" href="regex_iterator.html#boost_regex.ref.regex_iterator.examples">Examples</a>
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 <p>