refactor(pcre): inline Preg into its call sites and drop the crate

Preg had shed everything it owned: after the last few rounds its methods
were one-line forwards to the shim's preg_*(), differing only in a
default argument or a wrapper the caller unwrapped anyway. The 460 call
sites now name the shim function, and shirabe-pcre is gone from the
workspace along with its LICENSE entry.

The forwards expand as they read: isMatch becomes
preg_match2(.., 0).is_some() (is_none() where PHP negates it), isMatch3
and match3 drop the .is_some(), matchAll counts through
preg_match_all2(..).occurrence_count(), and replace4/replace5 spell out
the limit and count arguments preg_replace2 takes. Callbacks are the one
place the shapes differ: preg_replace_callback carries an error out of
the callback, so the fourteen infallible closures wrap their result in
Ok() and expect() it back.

Config::process() is the fifteenth, and it drops the `error` cell it
captured to smuggle a failure past a closure that could only return a
String. The `?` in the closure now carries it, which is what the PHP
does -- a throw from the callback leaves preg_replace_callback at the
failing match rather than running the remaining replacements and
reporting the last error.

The module doc that explained why composer/pcre's exceptions and
*StrictGroups() variants have no counterpart moves to the shim's preg
module, where the functions it describes live.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/crates/shirabe/src/util/http/response.rs b/crates/shirabe/src/util/http/response.rs
index bd117a24..ed5c5214 100644
--- a/crates/shirabe/src/util/http/response.rs
+++ b/crates/shirabe/src/util/http/response.rs
@@ -1,8 +1,7 @@
 //! ref: composer/src/Composer/Util/Http/Response.php
 
 use crate::json::JsonFile;
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{PhpMixed, php_regex, preg_quote};
+use shirabe_php_shim::{PhpMixed, php_regex, preg_match2, preg_quote};
 
 #[derive(Debug)]
 pub struct Response {
@@ -29,7 +28,7 @@ impl Response {
     pub fn get_status_message(&self) -> Option<String> {
         let mut value = None;
         for header in &self.headers {
-            if Preg::is_match(php_regex!(r"{^HTTP/\S+ \d+}i"), header) {
+            if preg_match2(php_regex!(r"{^HTTP/\S+ \d+}i"), header, 0).is_some() {
                 // In case of redirects, headers contain the headers of all responses
                 // so we can not return directly and need to keep iterating
                 value = Some(header.clone());
@@ -65,7 +64,7 @@ impl Response {
         let mut value = None;
         let pattern = format!("{{^{}:\\s*(.+?)\\s*$}}i", preg_quote(name, None));
         for header in headers {
-            if let Some(matches) = Preg::match3(&pattern, header)
+            if let Some(matches) = preg_match2(&pattern, header, 0)
                 && let Some(s) = matches.get(1)
             {
                 value = Some(s.to_string());