Document "\x{...}" and "\N{U+...}" Unicode escapes in PCRE patterns

Affected page

https://www.php.net/manual/en/regexp.reference.escape.php

Current issue

The PHP manual page describing escape sequences in PCRE patterns
(regexp.reference.escape.php) currently does not document two Unicode
escape syntaxes supported by PCRE2:

• \x{hhhh}
• \N{U+hhhh}

Both forms allow matching a Unicode character by its code point and are
supported by the PCRE2 engine.

Adding these escape sequences to the documentation would improve
completeness and help users write portable Unicode-aware regular
expressions.

reference:
https://pcre2project.github.io/pcre2/doc/pcre2pattern/

Suggested improvement

\x{hhhh}

Matches the Unicode character whose code point is U+hhhh.

\N{U+hhhh}

Matches the Unicode character whose code point is U+hhhh.

Additional context (optional)

No response

Open en/regexp.reference.escape.php, the affected manual page, and compare its escape-sequence coverage with the linked PCRE2 pattern reference. Add descriptions for \x{hhhh} and \N{U+hhhh}, then verify that both Unicode code-point escape syntaxes are documented accurately.