refactor(pcre): return the Preg $matches instead of filling an out-param

`Composer\Pcre\Preg` fills `$matches` through a by-ref parameter, and the
port mirrored that with a `&mut` (or `Option<&mut>`) out-param plus a
bool or count return. Callers had to declare an empty map one line ahead
of the call, and the type never said the map is only meaningful when the
call matched. Return the matches instead:

- match3/match4/is_match3/is_match4 -> Option<PregMatchedGroups>
- is_match_named -> Option<PregNamedGroups>
- match_all2/is_match_all -> PregMatchesAll
- is_match_all_with_offsets3 -> PregMatchesAllWithOffsets

Nothing is lost: the bool is `Option::is_some()`, and the occurrence
count is the length of any one column of a PREG_PATTERN_ORDER map, now
spelled `PregMatchesAll::occurrence_count()`. is_match() still answers
the bool question directly for callers that want no groups.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 4 insertions, 13 deletions

diff --git a/crates/shirabe/src/repository/composer_repository.rs b/crates/shirabe/src/repository/composer_repository.rs
index 33703709..6feb4359 100644
--- a/crates/shirabe/src/repository/composer_repository.rs
+++ b/crates/shirabe/src/repository/composer_repository.rs
@@ -37,7 +37,7 @@ use futures::StreamExt;
 use futures::stream::FuturesOrdered;
 use indexmap::IndexMap;
 use shirabe_metadata_minifier::MetadataMinifier;
-use shirabe_pcre::{CaptureKey, Preg, PregMatchedGroups};
+use shirabe_pcre::{CaptureKey, Preg};
 use shirabe_php_shim::Catch as _;
 use shirabe_php_shim::{
     AnyThrowable, CmpOp, InvalidArgumentException, LogicException, PHP_EOL, PhpMixed,
@@ -245,11 +245,9 @@ impl ComposerRepository {
             .to_string();
 
         // force url for packagist.org to repo.packagist.org
-        let mut match_packagist = PregMatchedGroups::new();
-        if Preg::is_match3(
+        if let Some(match_packagist) = Preg::is_match3(
             php_regex!(r"{^(?P<proto>https?)://packagist\.org/?$}i"),
             &url,
-            Some(&mut match_packagist),
         ) {
             let proto = match_packagist
                 .get(&CaptureKey::ByName("proto".to_string()))
@@ -781,11 +779,9 @@ impl ComposerRepository {
 
         if self.has_providers()? || self.lazy_providers_url.is_some() {
             // optimize search for "^foo/bar" where at least "^foo/" is present by loading this directly from the listUrl if present
-            let mut match_groups = PregMatchedGroups::new();
-            if Preg::is_match3(
+            if let Some(match_groups) = Preg::is_match3(
                 php_regex!(r"{^\^(?P<query>(?P<vendor>[a-z0-9_.-]+)/[a-z0-9_.-]*)\*?$}i"),
                 &query,
-                Some(&mut match_groups),
             ) && let Some(list_url) = self.list_url.as_ref()
             {
                 let q = match_groups
@@ -2430,12 +2426,7 @@ impl ComposerRepository {
         }
 
         if url.starts_with('/') {
-            let mut matches = PregMatchedGroups::new();
-            if Preg::is_match3(
-                php_regex!(r"{^[^:]++://[^/]*+}"),
-                &self.url,
-                Some(&mut matches),
-            ) {
+            if let Some(matches) = Preg::is_match3(php_regex!(r"{^[^:]++://[^/]*+}"), &self.url) {
                 return Ok(format!(
                     "{}{}",
                     matches