diff --git a/backend/analyze.go b/backend/analyze.go
index fd2fb6b..eb130a2 100644
--- a/backend/analyze.go
+++ b/backend/analyze.go
@@ -392,25 +392,27 @@
 	return info
 }
 
+// TODO(fxbug.dev/86590): Stop relying on regexes.
 var (
 	// https://fuchsia.dev/fuchsia-src/development/languages/fidl/reference/language.md#identifiers
 	fidlIdentifierPattern = `[a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?`
 
-	// Although "library" can be used anywhere (e.g. as a type name), this regex
-	// is robust because the the library declaration must appear at the top of
-	// the file (only comments and whitespace can precede it).
+	// Works most of the time, but breaks if there is an attribute with a string
+	// argument that contains ")".
 	libraryRegexp = regexp.MustCompile(`` +
-		`^(?:\s*//[^\n]*\n)*\s*` +
+		`^(?:` +
+		/* space     */ `\s` +
+		/* comment   */ `|//[^\n]*\n|` +
+		/* attribute */ `|@\s*` + fidlIdentifierPattern + `\s*` +
+		/* arguments */ `(?:\([^)]*\))?` +
+		`)*` +
 		`library\s+(` +
 		fidlIdentifierPattern +
 		`(?:\.` + fidlIdentifierPattern + `)*` +
 		`)\s*;`)
 
-	// Although "using" can be used anywhere (e.g. as a type name), this regex
-	// is robust because it only matches imports of platform libraries (ones
-	// that start with fidl, fuchsia, or test) and the special library zx. The
-	// only problem is it can match commented imports, so we have to check for
-	// this after matching.
+	// Works most of the time, but breaks if there is a string literal whose
+	// value looks like an import.
 	platformImportRegexp = regexp.MustCompile(`` +
 		`\busing\s+(` +
 		`zx|` +