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Emphasize the use of ?P<> for named sub-patterns instead of the backwards incompatible ?<>. Fixes bug #50306 - refs bug #46904

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@292248 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Jordi Boggiano 2009-12-17 12:28:26 +00:00
parent c83a8768d8
commit 740a7698af
2 changed files with 21 additions and 7 deletions
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18
reference/pcre/functions/preg-match-all.xml
View file

@ -162,7 +162,7 @@ echo $out[1][0] . ", " . $out[1][1] . "\n";
</para>
<note>
<para>
Using <parameter>offset</parameter> is not equivalent to passing
Using <parameter>offset</parameter> is not equivalent to passing
<literal>substr($subject, $offset)</literal> to
<function>preg_match_all</function> in place of the subject string,
because <parameter>pattern</parameter> can contain assertions such as
@ -197,6 +197,16 @@ echo $out[1][0] . ", " . $out[1][1] . "\n";
</row>
</thead>
<tbody>
<row>
<entry>5.2.2</entry>
<entry>
Named subpatterns now accept the
syntax <literal>(?&lt;name&gt;)</literal>
and <literal>(?'name')</literal> as well
as <literal>(?P&lt;name&gt;)</literal>. Previous versions
accepted only <literal>(?P&lt;name&gt;)</literal>.
</entry>
</row>
<row>
<entry>4.3.3</entry>
<entry>
@ -285,7 +295,11 @@ b: 2
c: 3
FOO;
preg_match_all('/(?<name>\w+): (?<digit>\d+)/', $str, $matches);
preg_match_all('/(?P<name>\w+): (?P<digit>\d+)/', $str, $matches);
/* This also works in PHP 5.2.2 (PCRE 7.0) and later, however
* the above form is recommended for backwards compatibility */
// preg_match_all('/(?<name>\w+): (?<digit>\d+)/', $str, $matches);
print_r($matches);

10
reference/pcre/functions/preg-match.xml
View file

@ -87,7 +87,7 @@
</para>
<note>
<para>
Using <parameter>offset</parameter> is not equivalent to passing
Using <parameter>offset</parameter> is not equivalent to passing
<literal>substr($subject, $offset)</literal> to
<function>preg_match</function> in place of the subject string,
because <parameter>pattern</parameter> can contain assertions such as
@ -286,11 +286,11 @@ domain name is: php.net
$str = 'foobar: 2008';
// Works in PHP 5.2.2 and later.
preg_match('/(?<name>\w+): (?<digit>\d+)/', $str, $matches);
preg_match('/(?P<name>\w+): (?P<digit>\d+)/', $str, $matches);
// Before PHP 5.2.2, use this:
// preg_match('/(?P<name>\w+): (?P<digit>\d+)/', $str, $matches);
/* This also works in PHP 5.2.2 (PCRE 7.0) and later, however
* the above form is recommended for backwards compatibility */
// preg_match('/(?<name>\w+): (?<digit>\d+)/', $str, $matches);
print_r($matches);