refactor(pcre): treat regex compile failure as fatal in shim

The preg_* shim helpers wrapped their results in Option/Result solely to
signal a regex that failed to compile. Composer never feeds a pattern
that fails at runtime, so such a failure is a programming error: panic
instead and drop the Option/Result wrappers, updating all callers.

preg_replace_callback keeps its Result return type since the callback
itself is fallible. preg_match_groups is removed in favor of preg_match
at its sole call site.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

3 files changed, 11 insertions, 13 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/console/input/argv_input.rs b/crates/shirabe-external-packages/src/symfony/console/input/argv_input.rs
index ea36e26..2b1102c 100644
--- a/crates/shirabe-external-packages/src/symfony/console/input/argv_input.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/input/argv_input.rs
@@ -528,8 +528,13 @@ impl ArgvInput {
             .tokens
             .iter()
             .map(|token| {
-                if let Some(m) = shirabe_php_shim::preg_match_groups("{^(-[^=]+=)(.+)}", token) {
-                    return format!("{}{}", m[1], self.inner.escape_token(&m[2]));
+                let mut r#match: Vec<Option<String>> = Vec::new();
+                if shirabe_php_shim::preg_match("{^(-[^=]+=)(.+)}", token, &mut r#match) != 0 {
+                    return format!(
+                        "{}{}",
+                        r#match[1].as_deref().unwrap_or(""),
+                        self.inner.escape_token(r#match[2].as_deref().unwrap_or(""))
+                    );
                 }
 
                 if !token.is_empty() && token.as_bytes()[0] != b'-' {
diff --git a/crates/shirabe-external-packages/src/symfony/console/input/input_option.rs b/crates/shirabe-external-packages/src/symfony/console/input/input_option.rs
index 7e2d086..5ef265e 100644
--- a/crates/shirabe-external-packages/src/symfony/console/input/input_option.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/input/input_option.rs
@@ -110,7 +110,7 @@ impl InputOption {
 
     fn normalize_shortcut(s: String) -> anyhow::Result<Option<String>> {
         let stripped = shirabe_php_shim::ltrim(&s, Some("-"));
-        let parts = shirabe_php_shim::preg_split(r"\|(-?)", &stripped).unwrap_or_default();
+        let parts = shirabe_php_shim::preg_split(r"\|(-?)", &stripped);
         let filtered: Vec<String> =
             shirabe_php_shim::array_filter(&parts, |s: &String| !s.is_empty());
         let result = shirabe_php_shim::implode("|", &filtered);
diff --git a/crates/shirabe-external-packages/src/symfony/console/input/string_input.rs b/crates/shirabe-external-packages/src/symfony/console/input/string_input.rs
index 952a18e..f57fcf6 100644
--- a/crates/shirabe-external-packages/src/symfony/console/input/string_input.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/input/string_input.rs
@@ -56,7 +56,6 @@ impl StringInput {
 
             let mut m: IndexMap<CaptureKey, Option<String>> = IndexMap::new();
             if shirabe_php_shim::preg_match2(r"/\s+/A", input, Some(&mut m), 0, cursor as usize)
-                .expect("invalid regex")
                 == 1
             {
                 if token.is_some() {
@@ -70,9 +69,7 @@ impl StringInput {
                 Some(&mut m),
                 0,
                 cursor as usize,
-            )
-            .expect("invalid regex")
-                == 1
+            ) == 1
             {
                 let inner = shirabe_php_shim::substr(
                     m[&CaptureKey::ByIndex(3)].as_deref().unwrap_or(""),
@@ -96,9 +93,7 @@ impl StringInput {
                 Some(&mut m),
                 0,
                 cursor as usize,
-            )
-            .expect("invalid regex")
-                == 1
+            ) == 1
             {
                 token = Some(format!(
                     "{}{}",
@@ -117,9 +112,7 @@ impl StringInput {
                 Some(&mut m),
                 0,
                 cursor as usize,
-            )
-            .expect("invalid regex")
-                == 1
+            ) == 1
             {
                 token = Some(format!(
                     "{}{}",