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, 6 insertions, 5 deletions

diff --git a/crates/shirabe/src/installer/binary_installer.rs b/crates/shirabe/src/installer/binary_installer.rs
index 4bcb6865..4e3b5e4c 100644
--- a/crates/shirabe/src/installer/binary_installer.rs
+++ b/crates/shirabe/src/installer/binary_installer.rs
@@ -8,11 +8,10 @@ use crate::util::Filesystem;
 use crate::util::Platform;
 use crate::util::ProcessExecutor;
 use crate::util::Silencer;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::{
     PhpMixed, basename, basename_with_suffix, chmod, dirname, fclose, fgets, file_exists,
-    file_get_contents5, file_put_contents, fopen, is_dir, is_file, is_link, php_regex, realpath,
-    rmdir, substr, trim, umask,
+    file_get_contents5, file_put_contents, fopen, is_dir, is_file, is_link, php_regex, preg_match2,
+    realpath, rmdir, substr, trim, umask,
 };
 
 /// Seam over the BinaryInstaller methods reached through LibraryInstaller, so tests can inject a
@@ -201,9 +200,10 @@ impl BinaryInstaller {
             }
             Err(_) => String::new(),
         };
-        if let Some(m) = Preg::is_match3(
+        if let Some(m) = preg_match2(
             php_regex!(r"{^#!/(?:usr/bin/env )?(?:[^/]+/)*(.+)$}m"),
             &line,
+            0,
         ) {
             return trim(m.get(1).unwrap_or(""), None);
         }
@@ -316,9 +316,10 @@ impl BinaryInstaller {
             file_get_contents5(bin, false, PhpMixed::Null, 0, Some(500)).unwrap_or_default();
         // For php files, we generate a PHP proxy instead of a shell one,
         // which allows calling the proxy with a custom php process
-        if let Some(m) = Preg::is_match3(
+        if let Some(m) = preg_match2(
             php_regex!(r"{^(#!.*\r?\n)?[\r\n\t ]*<\?php}"),
             &bin_contents,
+            0,
         ) {
             // carry over the existing shebang if present, otherwise add our own
             let proxy_code = match m.get(1) {