diff --git a/packages/functions/src/https.ts b/packages/functions/src/https.ts
index db92cad29..a6e510746 100644
--- a/packages/functions/src/https.ts
+++ b/packages/functions/src/https.ts
@@ -13,6 +13,7 @@ import {
   CustomerFull,
   sanitizeCustomer,
   DeliveryQueue,
+  checkExpected,
 } from "@eisbuk/shared";
 
 import { checkRequiredFields, EisbukHttpsError } from "./utils";
@@ -147,7 +148,7 @@ export const customerSelfRegister = functions
       const orgDoc = await orgRef.get();
       const orgData = orgDoc.data() as OrganizationData;
 
-      if (registrationCode !== orgData.registrationCode) {
+      if (!checkExpected(registrationCode, orgData.registrationCode || "")) {
         throw new EisbukHttpsError(
           "unauthenticated",
           HTTPSErrors.SelfRegInvalidCode,
diff --git a/packages/shared/src/utils/__tests__/text.test.ts b/packages/shared/src/utils/__tests__/text.test.ts
index e9a2dd73d..ce494a228 100644
--- a/packages/shared/src/utils/__tests__/text.test.ts
+++ b/packages/shared/src/utils/__tests__/text.test.ts
@@ -1,4 +1,4 @@
-import { interpolateText } from "../text";
+import { interpolateText, checkExpected } from "../text";
 
 describe("Text utils", () => {
   describe("interpolateText", () => {
@@ -35,5 +35,41 @@ describe("Text utils", () => {
       const interpolatedHtml = interpolateText(template, {});
       expect(interpolatedHtml).toBe("Ciao");
     });
+
+    test.only("Should ignore whitespace differences in registration code", async () => {
+      const cases = [
+        ["A string", "A string!"],
+        ["Look, ma, some spaces!", "LOOKMASOMESPACES"],
+        ["Let's try with apostrophes", "Let s try with apostrophes."],
+        ["On the others side", "On the other's side"],
+        [
+          "Nobody: use punctuation; You: expect it",
+          "Nobody? USE punctuation! You, expect it!",
+        ],
+      ];
+      for (const [input, expected] of cases) {
+        const result = checkExpected(input, expected);
+        if (!result) {
+          console.log("input", input);
+          console.log("expected", expected);
+        }
+        expect(result).toEqual(true);
+      }
+    });
+
+    test.only("Should fail when strings are different", async () => {
+      const cases = [
+        ["A string", "A string! You see?"],
+        ["Look, ma, some spaces!", "LOOKMANOSPACES"],
+      ];
+      for (const [input, expected] of cases) {
+        const result = checkExpected(input, expected);
+        if (result) {
+          console.log("input", input);
+          console.log("expected", expected);
+        }
+        expect(result).toEqual(false);
+      }
+    });
   });
 });
diff --git a/packages/shared/src/utils/text.ts b/packages/shared/src/utils/text.ts
index 72f2239c5..6bdac3a50 100644
--- a/packages/shared/src/utils/text.ts
+++ b/packages/shared/src/utils/text.ts
@@ -41,3 +41,13 @@ export const interpolateText = (
 
   return template.trim();
 };
+
+export const checkExpected = (input: string, expected: string) => {
+  /* Compares two strings without taking into account differences
+    in whitespace, punctuation, and capitalization.
+    If the two strings are equal, returns true, otherwise false.
+    */
+  const sanitizedInput = input.replace(/[\s,;:!?'.-]/g, "").toLowerCase();
+  const sanitizedExpected = expected.replace(/[\s,;:!?'.-]/g, "").toLowerCase();
+  return sanitizedInput === sanitizedExpected;
+};