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, 5 insertions, 4 deletions

diff --git a/crates/shirabe/src/repository/vcs/vcs_driver.rs b/crates/shirabe/src/repository/vcs/vcs_driver.rs
index a5192937..1a5ee72e 100644
--- a/crates/shirabe/src/repository/vcs/vcs_driver.rs
+++ b/crates/shirabe/src/repository/vcs/vcs_driver.rs
@@ -12,9 +12,8 @@ use crate::util::ProcessExecutor;
 use crate::util::http::Response;
 use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::Catch as _;
-use shirabe_php_shim::{DATE_RFC3339, PhpMixed, extension_loaded, php_regex};
+use shirabe_php_shim::{DATE_RFC3339, PhpMixed, extension_loaded, php_regex, preg_match2};
 
 #[derive(Debug)]
 pub struct VcsDriverBase {
@@ -57,7 +56,8 @@ impl VcsDriverBase {
     }
 
     pub fn should_cache(&self, identifier: &str) -> bool {
-        self.cache.is_some() && Preg::is_match(php_regex!("{^[a-f0-9]{40}$}iD"), identifier)
+        self.cache.is_some()
+            && preg_match2(php_regex!("{^[a-f0-9]{40}$}iD"), identifier, 0).is_some()
     }
 
     pub fn get_scheme(&self) -> &str {
@@ -202,7 +202,8 @@ pub trait VcsDriver: VcsDriverInterface {
     fn cache_mut(&mut self) -> Option<&mut Cache>;
 
     fn should_cache(&self, identifier: &str) -> bool {
-        self.cache().is_some() && Preg::is_match(php_regex!("{^[a-f0-9]{40}$}iD"), identifier)
+        self.cache().is_some()
+            && preg_match2(php_regex!("{^[a-f0-9]{40}$}iD"), identifier, 0).is_some()
     }
 
     fn get_composer_information(