refactor: extract ignore-format regexes into precompiled Pattern constants

Avoids recompiling regexes on every IgnoredLine call.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: a-oren

src/main/java/io/github/guacsec/trustifyda/providers/GoModulesProvider.java

@@ -62,6 +62,14 @@ public final class GoModulesProvider extends Provider {
       "TRUSTIFY_DA_GO_MVS_LOGIC_ENABLED";
   private static final Logger log = LoggersFactory.getLogger(GoModulesProvider.class.getName());
   public static final String DEFAULT_MAIN_VERSION = "v0.0.0";
+
+  private static final Pattern STANDALONE_IGNORE_PATTERN =
+      Pattern.compile("(exhortignore|trustify-da-ignore)");
+  private static final Pattern INDIRECT_IGNORE_PATTERN =
+      Pattern.compile("indirect\\s*;\\s*(//)?\\s*(exhortignore|trustify-da-ignore)");
+  private static final Pattern DEPENDENCY_LINE_PATTERN =
+      Pattern.compile("^[a-z.0-9/-]+\\s{1,2}[vV][0-9]\\.[0-9](\\.[0-9]){0,2}.*");
+
   private final String goExecutable;
 
   public String getMainModuleVersion() {
@@ -569,8 +577,8 @@ public boolean IgnoredLine(String line) {
         // "// indirect; // exhortignore").
         // Does NOT match "// indirect //exhortignore" (no semicolon) or
         // "// indirect exhortignore" (space-separated) — these are incorrect formats.
-        if (comment.matches("(exhortignore|trustify-da-ignore)")
-            || comment.matches("indirect\\s*;\\s*(//)?\\s*(exhortignore|trustify-da-ignore)")) {
+        if (STANDALONE_IGNORE_PATTERN.matcher(comment).matches()
+            || INDIRECT_IGNORE_PATTERN.matcher(comment).matches()) {
           // filter out lines where exhortignore or trustify-da-ignore has no meaning
           if (!trimmedRow.startsWith("module ")
               && !trimmedRow.startsWith("go ")
@@ -582,8 +590,7 @@ public boolean IgnoredLine(String line) {
               && !trimmedRow.startsWith("use ")
               && !trimmedRow.contains("=>")) {
             if (trimmedRow.startsWith("require ")
-                || Pattern.matches(
-                    "^[a-z.0-9/-]+\\s{1,2}[vV][0-9]\\.[0-9](\\.[0-9]){0,2}.*", trimmedRow)) {
+                || DEPENDENCY_LINE_PATTERN.matcher(trimmedRow).matches()) {
               result = true;
             }
           }