diff options
Diffstat (limited to 'libs/regex/doc/html/boost_regex/syntax/perl_syntax.html')
| -rw-r--r-- | libs/regex/doc/html/boost_regex/syntax/perl_syntax.html | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html b/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html index 2ba0eaf0bc..f7dbf24615 100644 --- a/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html +++ b/libs/regex/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, @@ -1314,6 +1315,21 @@ <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"> + =(?(<<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"> + =(?('<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>. </li> @@ -1324,6 +1340,12 @@ <span class="emphasis"><em>no-pattern</em></span>. </li> <li class="listitem"> + <code class="literal">(?(R&<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 used to define one or more named sub-expressions which are refered to |