diff --git a/src/core/operations/A1Z26CipherDecode.mjs b/src/core/operations/A1Z26CipherDecode.mjs
index cc9aafbf76..4cbe605da7 100644
--- a/src/core/operations/A1Z26CipherDecode.mjs
+++ b/src/core/operations/A1Z26CipherDecode.mjs
@@ -35,32 +35,32 @@ class A1Z26CipherDecode extends Operation {
         ];
         this.checks = [
             {
-                pattern:  "^\\s*([12]?[0-9] )+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6]) )+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["Space"]
             },
             {
-                pattern:  "^\\s*([12]?[0-9],)+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6]),)+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["Comma"]
             },
             {
-                pattern:  "^\\s*([12]?[0-9];)+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6]);)+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["Semi-colon"]
             },
             {
-                pattern:  "^\\s*([12]?[0-9]:)+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6]):)+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["Colon"]
             },
             {
-                pattern:  "^\\s*([12]?[0-9]\\n)+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6])\\n)+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["Line feed"]
             },
             {
-                pattern:  "^\\s*([12]?[0-9]\\r\\n)+[12]?[0-9]\\s*$",
+                pattern:  "^\\s*((?:0?[1-9]|1[0-9]|2[0-6])\\r\\n)+(?:0?[1-9]|1[0-9]|2[0-6])\\s*$",
                 flags:  "",
                 args:   ["CRLF"]
             }
diff --git a/tests/operations/tests/Magic.mjs b/tests/operations/tests/Magic.mjs
index 90401dc19c..59486454a8 100644
--- a/tests/operations/tests/Magic.mjs
+++ b/tests/operations/tests/Magic.mjs
@@ -152,5 +152,49 @@ TestRegister.addTests([
                 args: [1, false, false]
             }
         ]
+    },
+    {
+        name: "Magic: invalid zero A1Z26 values do not match",
+        input: "0,0",
+        unexpectedMatch: /A1Z26 Cipher Decode/,
+        recipeConfig: [
+            {
+                op: "Magic",
+                args: [0, false, false]
+            }
+        ]
+    },
+    {
+        name: "Magic: invalid high A1Z26 values do not match",
+        input: "27,1",
+        unexpectedMatch: /A1Z26 Cipher Decode/,
+        recipeConfig: [
+            {
+                op: "Magic",
+                args: [0, false, false]
+            }
+        ]
+    },
+    {
+        name: "Magic: valid leading-zero A1Z26 values match",
+        input: "26,01",
+        expectedMatch: /A1Z26 Cipher Decode/,
+        recipeConfig: [
+            {
+                op: "Magic",
+                args: [0, false, false]
+            }
+        ]
+    },
+    {
+        name: "Magic: valid leading-zero A1Z26 values match with two digits",
+        input: "09,10",
+        expectedMatch: /A1Z26 Cipher Decode/,
+        recipeConfig: [
+            {
+                op: "Magic",
+                args: [0, false, false]
+            }
+        ]
     }
 ]);