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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@63868 c90b9560-bf6c-de11-be94-00142212c4b1
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Gabor Hojtsy 2001-12-04 17:56:31 +00:00
parent aca8823f8f
commit 5b5e1f4a4b
1 changed files with 13 additions and 13 deletions
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26
functions/pcre.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.64 $ -->
<!-- $Revision: 1.65 $ -->
<reference id="ref.pcre">
<title>Regular Expression Functions (Perl-Compatible)</title>
<titleabbrev>PCRE</titleabbrev>
@ -947,7 +947,7 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
3. Capturing subpatterns that occur inside negative looka-
Capturing subpatterns that occur inside negative looka-
head assertions are counted, but their entries in the
offsets vector are never set. Perl sets its numerical vari-
ables from any such patterns that are matched before the
@ -958,7 +958,7 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
4. Though binary zero characters are supported in the sub-
Though binary zero characters are supported in the sub-
ject string, they are not allowed in a pattern string
because it is passed as a normal C string, terminated by
zero. The escape sequence "\0" can be used in the pattern to
@ -967,7 +967,7 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
5. The following Perl escape sequences are not supported:
The following Perl escape sequences are not supported:
\l, \u, \L, \U, \E, \Q. In fact these are implemented by
Perl's general string-handling and are not part of its pat-
tern matching engine.
@ -975,19 +975,19 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
6. The Perl \G assertion is not supported as it is not
The Perl \G assertion is not supported as it is not
relevant to single pattern matches.
</simpara>
</listitem>
<listitem>
<simpara>
7. Fairly obviously, PCRE does not support the (?{code})
Fairly obviously, PCRE does not support the (?{code})
construction.
</simpara>
</listitem>
<listitem>
<simpara>
8. There are at the time of writing some oddities in Perl
There are at the time of writing some oddities in Perl
5.005_02 concerned with the settings of captured strings
when part of a pattern is repeated. For example, matching
"aba" against the pattern /^(a(b)?)+$/ sets $2 to the value
@ -1001,7 +1001,7 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
9. Another as yet unresolved discrepancy is that in Perl
Another as yet unresolved discrepancy is that in Perl
5.005_02 the pattern /^(a)?(?(1)a|b)+$/ matches the string
"a", whereas in PCRE it does not. However, in both Perl and
PCRE /^(a)?a/ matched against "a" leaves $1 unset.
@ -1009,12 +1009,12 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<para>
10. PCRE provides some extensions to the Perl regular
PCRE provides some extensions to the Perl regular
expression facilities:
<orderedlist>
<listitem>
<simpara>
(a) Although lookbehind assertions must match fixed length
Although lookbehind assertions must match fixed length
strings, each alternative branch of a lookbehind assertion
can match a different length of string. Perl 5.005 requires
them all to have the same length.
@ -1022,7 +1022,7 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
(b) If <link linkend="pcre.pattern.modifiers">PCRE_DOLLAR_ENDONLY</link> is set and
If <link linkend="pcre.pattern.modifiers">PCRE_DOLLAR_ENDONLY</link> is set and
<link linkend="pcre.pattern.modifiers">PCRE_MULTILINE</link> is not
set, the $ meta- character matches only at the very end of
the string.
@ -1030,13 +1030,13 @@ $fl_array = preg_grep ("/^(\d+)?\.\d+$/", $array);
</listitem>
<listitem>
<simpara>
(c) If <link linkend="pcre.pattern.modifiers">PCRE_EXTRA</link> is set, a backslash followed by a letter
If <link linkend="pcre.pattern.modifiers">PCRE_EXTRA</link> is set, a backslash followed by a letter
with no special meaning is faulted.
</simpara>
</listitem>
<listitem>
<simpara>
(d) If <link linkend="pcre.pattern.modifiers">PCRE_UNGREEDY</link> is set, the greediness of the repeti-
If <link linkend="pcre.pattern.modifiers">PCRE_UNGREEDY</link> is set, the greediness of the repeti-
tion quantifiers is inverted, that is, by default they are
not greedy, but if followed by a question mark they are.
</simpara>