Exclude Delete character from hex dump output (#2086)

Co-authored-by: GCHQ Developer C85297 <95289555+C85297@users.noreply.github.com>

src/core/Utils.mjs

@@ -177,7 +177,7 @@ class Utils {
      */
     static printable(str, preserveWs=false, onlyAscii=false) {
         if (onlyAscii) {
-            return str.replace(/[^\x20-\x7f]/g, ".");
+            return str.replace(/[^\x20-\x7e]/g, ".");
         }
 
         // eslint-disable-next-line no-misleading-character-class

tests/node/tests/Utils.mjs

@@ -20,4 +20,10 @@ TestRegister.addApiTests([
         assert.equal(Utils.parseEscapedChars("\\\\\\'"), "\\'");
     }),
 
+    it("Utils: should replace delete character", () => {
+        assert.equal(
+            Utils.printable("\x7e\x7f\x80\xa7", false, true),
+            "\x7e...",
+        );
+    }),
 ]);