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, 12 insertions, 5 deletions

diff --git a/crates/shirabe/src/util/github.rs b/crates/shirabe/src/util/github.rs
index 570a33bb..9d73ae84 100644
--- a/crates/shirabe/src/util/github.rs
+++ b/crates/shirabe/src/util/github.rs
@@ -8,9 +8,10 @@ use crate::io::io_interface;
 use crate::util::HttpDownloader;
 use crate::util::ProcessExecutor;
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::Catch as _;
-use shirabe_php_shim::{PhpMixed, date_local, in_array_loose, php_regex, stripos, strtolower};
+use shirabe_php_shim::{
+    PhpMixed, date_local, in_array_loose, php_regex, preg_match2, stripos, strtolower,
+};
 
 #[derive(Debug)]
 pub struct GitHub {
@@ -325,7 +326,7 @@ impl GitHub {
             if stripos(header, "x-github-sso: required").is_none() {
                 continue;
             }
-            if let Some(caps) = Preg::match3(php_regex!(r"{\burl=(?P<url>[^\s;]+)}"), header) {
+            if let Some(caps) = preg_match2(php_regex!(r"{\burl=(?P<url>[^\s;]+)}"), header, 0) {
                 return caps.name("url").map(str::to_string);
             }
         }
@@ -335,7 +336,13 @@ impl GitHub {
 
     pub fn is_rate_limited(&self, headers: &[String]) -> bool {
         for header in headers {
-            if Preg::is_match(php_regex!(r"{^x-ratelimit-remaining: *0$}i"), header.trim()) {
+            if preg_match2(
+                php_regex!(r"{^x-ratelimit-remaining: *0$}i"),
+                header.trim(),
+                0,
+            )
+            .is_some()
+            {
                 return true;
             }
         }
@@ -345,7 +352,7 @@ impl GitHub {
 
     pub fn requires_sso(&self, headers: &[String]) -> bool {
         for header in headers {
-            if Preg::is_match(php_regex!(r"{^x-github-sso: required}i"), header.trim()) {
+            if preg_match2(php_regex!(r"{^x-github-sso: required}i"), header.trim(), 0).is_some() {
                 return true;
             }
         }