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, 9 insertions, 8 deletions

diff --git a/crates/shirabe/src/package/loader/root_package_loader.rs b/crates/shirabe/src/package/loader/root_package_loader.rs
index 012c30fd..bc49ffc0 100644
--- a/crates/shirabe/src/package/loader/root_package_loader.rs
+++ b/crates/shirabe/src/package/loader/root_package_loader.rs
@@ -15,9 +15,9 @@ use crate::repository::RepositoryManager;
 use crate::util::Platform;
 use crate::util::ProcessExecutor;
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::{
-    PhpMixed, RuntimeException, UnexpectedValueException, php_regex, preg_split, strtolower,
+    PhpMixed, RuntimeException, UnexpectedValueException, php_regex, preg_match2, preg_replace,
+    preg_split, strtolower,
 };
 
 #[derive(Debug)]
@@ -252,9 +252,10 @@ impl RootPackageLoader {
         mut aliases: Vec<IndexMap<String, String>>,
     ) -> Vec<IndexMap<String, String>> {
         for (req_name, req_version) in requires {
-            if let Some(m) = Preg::is_match3(
+            if let Some(m) = preg_match2(
                 php_regex!(r"{(?:^|\| *|, *)([^,\s#|]+)(?:#[^ ]+)? +as +([^,\s|]+)(?:$| *\|| *,)}"),
                 req_version,
+                0,
             ) {
                 let m1 = m.get(1).unwrap_or_default().to_string();
                 let m2 = m.get(2).unwrap_or_default().to_string();
@@ -316,7 +317,7 @@ impl RootPackageLoader {
 
             let mut matched = false;
             for constraint in &constraints {
-                if let Some(m) = Preg::is_match3(&pattern, constraint) {
+                if let Some(m) = preg_match2(&pattern, constraint, 0) {
                     let name = strtolower(req_name);
                     let m1 = m.get(1).unwrap_or_default().to_string();
                     let normalized_m1 = VersionParser::normalize_stability(&m1).unwrap_or_default();
@@ -336,8 +337,8 @@ impl RootPackageLoader {
 
             for constraint in &constraints {
                 let req_version_stripped =
-                    Preg::replace(php_regex!(r"{^([^,\s@]+) as .+$}"), "$1", constraint);
-                if Preg::is_match(php_regex!(r"{^[^,\s@]+$}"), &req_version_stripped) {
+                    preg_replace(php_regex!(r"{^([^,\s@]+) as .+$}"), "$1", constraint);
+                if preg_match2(php_regex!(r"{^[^,\s@]+$}"), &req_version_stripped, 0).is_some() {
                     let stability_name = VersionParser::parse_stability(&req_version_stripped);
                     if stability_name != "stable" {
                         let name = strtolower(req_name);
@@ -361,8 +362,8 @@ impl RootPackageLoader {
         mut references: IndexMap<String, String>,
     ) -> IndexMap<String, String> {
         for (req_name, req_version) in requires {
-            let req_version = Preg::replace(php_regex!(r"{^([^,\s@]+) as .+$}"), "$1", req_version);
-            if let Some(m) = Preg::is_match3(php_regex!(r"{^[^,\s@]+?#([a-f0-9]+)$}"), &req_version)
+            let req_version = preg_replace(php_regex!(r"{^([^,\s@]+) as .+$}"), "$1", req_version);
+            if let Some(m) = preg_match2(php_regex!(r"{^[^,\s@]+?#([a-f0-9]+)$}"), &req_version, 0)
                 && VersionParser::parse_stability(&req_version) == "dev"
             {
                 let name = strtolower(req_name);