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[PHP 8.4] PCRE - PCRE2-v10.44 updates #4078

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Nov 20, 2024
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[PHP 8.4] PCRE - PCRE2-v10.44 updates #4078

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2a57917
[PHP 8.4] PCRE: Add `/r` modifier
Ayesh Nov 16, 2024
8d3c7b0
[PHP 8.4] PCRE: Add PCRE2-v10.44 quantifier changes
Ayesh Nov 16, 2024
bc9f56b
simpara
Girgias Nov 20, 2024
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16 changes: 16 additions & 0 deletions reference/pcre/pattern.modifiers.xml
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Expand Up @@ -187,6 +187,22 @@
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><emphasis>r</emphasis> (<literal>PCRE2_EXTRA_CASELESS_RESTRICT</literal>)</term>
<listitem>
<simpara>
When <emphasis>u</emphasis> (<literal>PCRE_UTF8</literal>) and <emphasis>i</emphasis> (<literal>PCRE_CASELESS</literal>)
are in effect, this modifier prevents matching across ASCII and non-ASCII characters.
</simpara>
<simpara>
For example, <code>preg_match('/\x{212A}/iu', "K")</code> matches the Kelvin sign <literal>K</literal> (U+212A).
When <emphasis>u</emphasis> is used (<code>preg_match('/\x{212A}/iur', "K")</code>), it does not match.
</simpara>
<simpara>
Available as of PHP 8.4.0.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</blockquote>
</para>
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19 changes: 15 additions & 4 deletions reference/pcre/pattern.syntax.xml
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Expand Up @@ -1573,12 +1573,23 @@

<literal>\d{8}</literal>

matches exactly 8 digits. An opening curly bracket that
matches exactly 8 digits.

</para>
<simpara>
Prior to PHP 8.4.0, an opening curly bracket that
appears in a position where a quantifier is not allowed, or
one that does not match the syntax of a quantifier, is taken
as a literal character. For example, {,6} is not a quantifier,
but a literal string of four characters.
</para>
as a literal character. For example, <literal>{,6}</literal>
is not a quantifier, but a literal string of four characters.

As of PHP 8.4.0, the PCRE extension is bundled with PCRE2 version 10.44,
which allows patterns such as <literal>\d{,8}</literal> and they are
interpreted as <literal>\d{0,8}</literal>.

Further, as of PHP 8.4.0, space characters around quantifiers such as
<literal>\d{0 , 8}</literal> and <literal>\d{ 0 , 8 }</literal> are allowed.
</simpara>
<para>
The quantifier {0} is permitted, causing the expression to
behave as if the previous item and the quantifier were not
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