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, 9 insertions, 6 deletions

diff --git a/crates/shirabe/tests/all_functional_test.rs b/crates/shirabe/tests/all_functional_test.rs
index d947a054..36137955 100644
--- a/crates/shirabe/tests/all_functional_test.rs
+++ b/crates/shirabe/tests/all_functional_test.rs
@@ -8,8 +8,7 @@
 use indexmap::IndexMap;
 use serial_test::serial;
 use shirabe::util::filesystem::Filesystem;
-use shirabe_pcre::preg::Preg;
-use shirabe_php_shim::{PhpMixed, intval, php_regex, preg_split_delim_capture};
+use shirabe_php_shim::{PhpMixed, intval, php_regex, preg_match2, preg_split_delim_capture};
 use std::path::{Path, PathBuf};
 
 /// ref: AllFunctionalTest's `$oldcwd` / `$testDir` instance state plus its `setUp`/`tearDown`.
@@ -141,13 +140,13 @@ fn expect_matches(expected: &str, output: &str) {
             line += 1;
         }
         if eb[i] == b'%' {
-            let Some(m) = Preg::is_match3(php_regex!("{%(.+?)%}"), &expected[i..]) else {
+            let Some(m) = preg_match2(php_regex!("{%(.+?)%}"), &expected[i..], 0) else {
                 panic!("Failed to match %...% in {}", &expected[i..]);
             };
             let regex = m.get(1).map(str::to_string).unwrap();
 
             let pattern = format!("{{{}}}", regex);
-            if let Some(m) = Preg::is_match3(&pattern, &output[j..]) {
+            if let Some(m) = preg_match2(&pattern, &output[j..], 0) {
                 let full = m.get(0).map(str::to_string).unwrap();
                 i += regex.len() + 2;
                 j += full.len();
@@ -222,12 +221,16 @@ fn run_integration(test_filename: &str) {
         expect_matches(expected, output);
     }
     if let Some(expect_regex) = test_data.get("EXPECT-REGEX") {
-        assert!(Preg::is_match(expect_regex, &clean_output(&raw_output)));
+        assert!(preg_match2(expect_regex, &clean_output(&raw_output), 0).is_some());
     }
     if let Some(expect_regexes) = test_data.get("EXPECT-REGEXES") {
         let clean = clean_output(&raw_output);
         for regex in expect_regexes.split('\n') {
-            assert!(Preg::is_match(regex, &clean), "Output: {}", raw_output);
+            assert!(
+                preg_match2(regex, &clean, 0).is_some(),
+                "Output: {}",
+                raw_output
+            );
         }
     }
     if let Some(expect_exit_code) = test_data.get("EXPECT-EXIT-CODE") {