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, 2 insertions, 3 deletions

diff --git a/crates/shirabe-class-map-generator/src/class_map.rs b/crates/shirabe-class-map-generator/src/class_map.rs
index 4eb6ae48..982d8494 100644
--- a/crates/shirabe-class-map-generator/src/class_map.rs
+++ b/crates/shirabe-class-map-generator/src/class_map.rs
@@ -1,8 +1,7 @@
 //! ref: composer/vendor/composer/class-map-generator/src/ClassMap.php
 
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{OutOfBoundsException, rtrim, strpos, strtr};
+use shirabe_php_shim::{OutOfBoundsException, preg_match2, rtrim, strpos, strtr};
 
 #[derive(Debug, Clone)]
 pub struct PsrViolationEntry {
@@ -67,7 +66,7 @@ impl ClassMap {
         for (class, paths) in &self.ambiguous_classes {
             let paths: Vec<String> = paths
                 .iter()
-                .filter(|path| !Preg::is_match(duplicates_filter, &strtr(path, "\\", "/")))
+                .filter(|path| preg_match2(duplicates_filter, &strtr(path, "\\", "/"), 0).is_none())
                 .cloned()
                 .collect();
             if !paths.is_empty() {