diff --git a/src/helpers/numbers.ts b/src/helpers/numbers.ts
index 0b3a677bab..43061a1933 100644
--- a/src/helpers/numbers.ts
+++ b/src/helpers/numbers.ts
@@ -8,7 +8,7 @@
  *   formula, commas are used to separate arguments
  * - it does not support % symbol, in formulas % is an operator
  */
-export const formulaNumberRegexp = /^-?\d+(\.?\d*(e\d+)?)?|^-?\.\d+/;
+export const formulaNumberRegexp = /(^-?\d+(\.?\d*(e\d+)?)?|^-?\.\d+)(?!\w|!)/;
 
 const pIntegerAndDecimals = "(\\d+(,\\d{3,})*(\\.\\d*)?)"; // pattern that match integer number with or without decimal digits
 const pOnlyDecimals = "(\\.\\d+)"; // pattern that match only expression with decimal digits
diff --git a/tests/formulas/tokenizer.test.ts b/tests/formulas/tokenizer.test.ts
index 05c4240c75..45ac00b81e 100644
--- a/tests/formulas/tokenizer.test.ts
+++ b/tests/formulas/tokenizer.test.ts
@@ -208,6 +208,22 @@ describe("tokenizer", () => {
       { type: "OPERATOR", value: "=" },
       { type: "REFERENCE", value: "'a '' b'!A1" },
     ]);
+    expect(tokenize("=1name!A1")).toEqual([
+      { type: "OPERATOR", value: "=" },
+      { type: "REFERENCE", value: "1name!A1" },
+    ]);
+    expect(tokenize("=123!A1")).toEqual([
+      { type: "OPERATOR", value: "=" },
+      { type: "REFERENCE", value: "123!A1" },
+    ]);
+    expect(tokenize("='1name'!A1")).toEqual([
+      { type: "OPERATOR", value: "=" },
+      { type: "REFERENCE", value: "'1name'!A1" },
+    ]);
+    expect(tokenize("='123'!A1")).toEqual([
+      { type: "OPERATOR", value: "=" },
+      { type: "REFERENCE", value: "'123'!A1" },
+    ]);
   });
 
   test("wrong references", () => {