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jzmaddock
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doc/html/boost_regex/syntax/perl_syntax.html
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<p>
Note that a back reference can also be a forward-reference to a sub-expression
that has not yet been seen - this only really makes sense within a repeat,
so for example <code class="computeroutput"><span class="special">(\</span><span class="number">2</span><span class="identifier">two</span><span class="special">|(</span><span class="identifier">one</span><span class="special">))+</span></code> will match "oneonetwo".
</p>
<p>
Finally the \k escape can be used to refer to named subexpressions, for example
<code class="literal">\k&lt;two&gt;</code> will match whatever matched the subexpression
<code class="literal">\k&lt;two&gt;</code> will whatever matched the subexpression
named "two".
</p>
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