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/util/hg.rs b/crates/shirabe/src/util/hg.rs
index f95f15d5..00fee240 100644
--- a/crates/shirabe/src/util/hg.rs
+++ b/crates/shirabe/src/util/hg.rs
@@ -5,8 +5,7 @@ use crate::io::IOInterface;
 use crate::io::IOInterfaceImmutable;
 use crate::util::ProcessExecutor;
 use crate::util::Url;
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{php_regex, rawurlencode};
+use shirabe_php_shim::{php_regex, preg_match2, rawurlencode};
 use std::sync::OnceLock;
 
 static VERSION: OnceLock<Option<String>> = OnceLock::new();
@@ -56,11 +55,12 @@ impl Hg {
         }
 
         // Try with the authentication information available
-        let matched = Preg::is_match3(
+        let matched = preg_match2(
             php_regex!(
                 r"{^(?P<proto>ssh|https?)://(?:(?P<user>[^:@]+)(?::(?P<pass>[^:@]+))?@)?(?P<host>[^/]+)(?P<path>/.*)?}mi"
             ),
             &url,
+            0,
         );
 
         if let Some(matches) = matched
@@ -151,9 +151,10 @@ impl Hg {
                     &mut output,
                     None,
                 ) == 0
-                    && let Some(matches) = Preg::is_match3(
+                    && let Some(matches) = preg_match2(
                         php_regex!(r"/^.+? (\d+(?:\.\d+)+)(?:\+.*?)?\)?\r?\n/"),
                         &output,
+                        0,
                     )
                 {
                     return matches.get(1).map(str::to_string);