diff --git a/html/tokenizer.ts b/html/tokenizer.ts
index 6709751..a8f36a7 100644
--- a/html/tokenizer.ts
+++ b/html/tokenizer.ts
@@ -540,15 +540,15 @@ export class Tokenizer {
     }
 
     private asciiUpperAlpha(input: string): boolean {
-        return /[^\u0041-\u005A]/.test(input);
+        return /[\u0041-\u005A]/.test(input);
     }
 
     private asciiLowerAlpha(input: string): boolean {
-        return /[^\u0061-\u007A]/.test(input);
+        return /[\u0061-\u007A]/.test(input);
     }
 
     private asciiDigit(input: string): boolean {
-        return /[^\u0030-\u0030]/.test(input);
+        return /[\u0030-\u0030]/.test(input);
     }
 
     private reconsumeIn(state: State): void {