refactor(preg): split PregMatches reads into get() and name()

PregMatches keyed both forms of a capture group through CaptureKey, so
every read built one: a usize wrapped in an enum, or worse, a String
allocated to name a group that regex::Captures can look up from a &str.
It now mirrors regex::Captures instead -- get() takes the group number,
name() the group name -- and the enum drops out of the type entirely.

That is 285 call sites across 59 files, and the named ones carry most of
the win: `matches.get(&CaptureKey::ByName("host".to_string()))` reads as
`matches.name("host")`. ProcessExecutor loses a `user_key` binding that
existed only to build the key once.

CaptureKey stays as the key type of PregMatchesAll and
PregMatchesAllWithOffsets, where numbered and named entries share one
IndexMap and a key type is the point. Five files still name it.

Also retargets the two preg_match_all comments that described the
occurrence count through `matches[&CaptureKey::ByIndex(0)].len()`, an
Index impl these types no longer carry.

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

4 files changed, 16 insertions, 47 deletions

diff --git a/crates/shirabe/src/package/loader/root_package_loader.rs b/crates/shirabe/src/package/loader/root_package_loader.rs
index 1d068ad6..012c30fd 100644
--- a/crates/shirabe/src/package/loader/root_package_loader.rs
+++ b/crates/shirabe/src/package/loader/root_package_loader.rs
@@ -15,7 +15,7 @@ use crate::repository::RepositoryManager;
 use crate::util::Platform;
 use crate::util::ProcessExecutor;
 use indexmap::IndexMap;
-use shirabe_pcre::{CaptureKey, Preg};
+use shirabe_pcre::Preg;
 use shirabe_php_shim::{
     PhpMixed, RuntimeException, UnexpectedValueException, php_regex, preg_split, strtolower,
 };
@@ -256,14 +256,8 @@ impl RootPackageLoader {
                 php_regex!(r"{(?:^|\| *|, *)([^,\s#|]+)(?:#[^ ]+)? +as +([^,\s|]+)(?:$| *\|| *,)}"),
                 req_version,
             ) {
-                let m1 = m
-                    .get(&CaptureKey::ByIndex(1))
-                    .unwrap_or_default()
-                    .to_string();
-                let m2 = m
-                    .get(&CaptureKey::ByIndex(2))
-                    .unwrap_or_default()
-                    .to_string();
+                let m1 = m.get(1).unwrap_or_default().to_string();
+                let m2 = m.get(2).unwrap_or_default().to_string();
                 let mut alias = IndexMap::new();
                 alias.insert("package".to_string(), strtolower(req_name));
                 alias.insert(
@@ -324,10 +318,7 @@ impl RootPackageLoader {
             for constraint in &constraints {
                 if let Some(m) = Preg::is_match3(&pattern, constraint) {
                     let name = strtolower(req_name);
-                    let m1 = m
-                        .get(&CaptureKey::ByIndex(1))
-                        .unwrap_or_default()
-                        .to_string();
+                    let m1 = m.get(1).unwrap_or_default().to_string();
                     let normalized_m1 = VersionParser::normalize_stability(&m1).unwrap_or_default();
                     let stability = stabilities[normalized_m1.as_str()];
 
@@ -375,12 +366,7 @@ impl RootPackageLoader {
                 && VersionParser::parse_stability(&req_version) == "dev"
             {
                 let name = strtolower(req_name);
-                references.insert(
-                    name,
-                    m.get(&CaptureKey::ByIndex(1))
-                        .unwrap_or_default()
-                        .to_string(),
-                );
+                references.insert(name, m.get(1).unwrap_or_default().to_string());
             }
         }
         references
diff --git a/crates/shirabe/src/package/locker.rs b/crates/shirabe/src/package/locker.rs
index f27f44a2..7d45e573 100644
--- a/crates/shirabe/src/package/locker.rs
+++ b/crates/shirabe/src/package/locker.rs
@@ -24,7 +24,7 @@ use crate::repository::RootPackageRepository;
 use crate::util::Git as GitUtil;
 use crate::util::ProcessExecutor;
 use indexmap::IndexMap;
-use shirabe_pcre::{CaptureKey, Preg};
+use shirabe_pcre::Preg;
 use shirabe_php_shim::Catch as _;
 use shirabe_php_shim::{
     DATE_RFC3339, LogicException, PhpMixed, RuntimeException, array_intersect, array_keys,
@@ -848,7 +848,7 @@ impl Locker {
                         output.as_string().unwrap_or(""),
                     ) {
                         let ts = m
-                            .get(&CaptureKey::ByIndex(1))
+                            .get(1)
                             .unwrap_or_default()
                             .to_string()
                             .parse::<i64>()
diff --git a/crates/shirabe/src/package/package.rs b/crates/shirabe/src/package/package.rs
index c987f2fe..2e2d5feb 100644
--- a/crates/shirabe/src/package/package.rs
+++ b/crates/shirabe/src/package/package.rs
@@ -434,11 +434,7 @@ impl Package {
             self.set_dist_url(Some(Preg::replace_callback(
                 php_regex!("{(/|sha=)[a-f0-9]{40}(/|$)}i"),
                 |m: &shirabe_pcre::PregMatches| -> String {
-                    let get = |i: usize| -> String {
-                        m.get(&shirabe_pcre::CaptureKey::ByIndex(i))
-                            .unwrap_or_default()
-                            .to_string()
-                    };
+                    let get = |i: usize| -> String { m.get(i).unwrap_or_default().to_string() };
                     format!("{}{}{}", get(1), reference, get(2))
                 },
                 &self.get_dist_url().unwrap_or_default(),
diff --git a/crates/shirabe/src/package/version/version_guesser.rs b/crates/shirabe/src/package/version/version_guesser.rs
index a01bf469..c85000e7 100644
--- a/crates/shirabe/src/package/version/version_guesser.rs
+++ b/crates/shirabe/src/package/version/version_guesser.rs
@@ -12,7 +12,7 @@ use crate::util::ProcessExecutor;
 use crate::util::Svn as SvnUtil;
 use crate::util::sync_executor;
 use indexmap::IndexMap;
-use shirabe_pcre::{CaptureKey, Preg};
+use shirabe_pcre::Preg;
 use shirabe_php_shim::{
     PhpMixed, RuntimeException, array_keys, array_map, array_merge, empty, function_exists,
     implode, is_string, json_encode, php_regex, preg_quote, str_replace, strlen, strnatcasecmp,
@@ -236,14 +236,8 @@ impl VersionGuesser {
                         &branch,
                     )
                 {
-                    let g1 = m
-                        .get(&CaptureKey::ByIndex(1))
-                        .unwrap_or_default()
-                        .to_string();
-                    let g2 = m
-                        .get(&CaptureKey::ByIndex(2))
-                        .unwrap_or_default()
-                        .to_string();
+                    let g1 = m.get(1).unwrap_or_default().to_string();
+                    let g2 = m.get(2).unwrap_or_default().to_string();
                     if g1 == "(no branch)"
                         || strpos(&g1, "(detached ") == Some(0)
                         || strpos(&g1, "(HEAD detached at") == Some(0)
@@ -270,11 +264,7 @@ impl VersionGuesser {
                         &branch,
                     )
                 {
-                    branches.push(
-                        m.get(&CaptureKey::ByIndex(1))
-                            .unwrap_or_default()
-                            .to_string(),
-                    );
+                    branches.push(m.get(1).unwrap_or_default().to_string());
                 }
             }
 
@@ -708,9 +698,9 @@ impl VersionGuesser {
             );
 
             if let Some(matches) = Preg::is_match3(&url_pattern, &output) {
-                let m1 = matches.get(&CaptureKey::ByIndex(1)).unwrap_or_default();
-                let m2 = matches.get(&CaptureKey::ByIndex(2));
-                let m3 = matches.get(&CaptureKey::ByIndex(3));
+                let m1 = matches.get(1).unwrap_or_default();
+                let m2 = matches.get(2);
+                let m3 = matches.get(3);
                 if let Some(m2) = m2
                     && let Some(m3) = m3
                     && (branches_path == *m2 || tags_path == *m2)
@@ -761,10 +751,7 @@ impl VersionGuesser {
             }
         };
         if let Some(m) = Preg::is_match3(php_regex!(r"{^(\d+(?:\.\d+)*)-dev$}i"), &version) {
-            return Ok(format!(
-                "{}.x-dev",
-                m.get(&CaptureKey::ByIndex(1)).unwrap_or_default()
-            ));
+            return Ok(format!("{}.x-dev", m.get(1).unwrap_or_default()));
         }
 
         Ok(version)