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, 3 insertions, 4 deletions

diff --git a/crates/shirabe/src/question/strict_confirmation_question.rs b/crates/shirabe/src/question/strict_confirmation_question.rs
index 107b9c25..f1240336 100644
--- a/crates/shirabe/src/question/strict_confirmation_question.rs
+++ b/crates/shirabe/src/question/strict_confirmation_question.rs
@@ -1,7 +1,6 @@
 //! ref: composer/src/Composer/Question/StrictConfirmationQuestion.php
 
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{PhpMixed, empty, is_bool};
+use shirabe_php_shim::{PhpMixed, empty, is_bool, preg_match2};
 use shirabe_symfony_console::exception::InvalidArgumentException;
 use shirabe_symfony_console::question::Question;
 use shirabe_symfony_console::question::QuestionInterface;
@@ -54,10 +53,10 @@ impl StrictConfirmationQuestion {
                 return default.clone();
             }
             if let PhpMixed::String(s) = &answer {
-                if Preg::is_match(&true_regex, s) {
+                if preg_match2(&true_regex, s, 0).is_some() {
                     return PhpMixed::Bool(true);
                 }
-                if Preg::is_match(&false_regex, s) {
+                if preg_match2(&false_regex, s, 0).is_some() {
                     return PhpMixed::Bool(false);
                 }
             }