refactor(preg): add preg_is_match for existence-only call sites

The capture groups were discarded at 162 of the preg_match call sites,
which only tested the Option. They now call preg_is_match, which lets the
regex engine skip capture tracking.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/util/http/response.rs b/crates/shirabe/src/util/http/response.rs
index 6fe95200..4f824baa 100644
--- a/crates/shirabe/src/util/http/response.rs
+++ b/crates/shirabe/src/util/http/response.rs
@@ -1,7 +1,7 @@
 //! ref: composer/src/Composer/Util/Http/Response.php
 
 use crate::json::JsonFile;
-use shirabe_php_shim::{PhpMixed, php_regex, preg_match, preg_quote};
+use shirabe_php_shim::{PhpMixed, php_regex, preg_is_match, preg_match, preg_quote};
 
 #[derive(Debug)]
 pub struct Response {
@@ -28,7 +28,7 @@ impl Response {
     pub fn get_status_message(&self) -> Option<String> {
         let mut value = None;
         for header in &self.headers {
-            if preg_match(php_regex!(r"{^HTTP/\S+ \d+}i"), header).is_some() {
+            if preg_is_match(php_regex!(r"{^HTTP/\S+ \d+}i"), header) {
                 // In case of redirects, headers contain the headers of all responses
                 // so we can not return directly and need to keep iterating
                 value = Some(header.clone());