Match regex rule with data-models

Author: curlyfriesplease

src/pages/GiftAid/utils/Utils.js

@@ -51,9 +51,10 @@ export const getPathParams = (update = false) => {
   };
 };
 
+// Regex matches what we use in data-models, which the backend uses to validate postcodes.
 export const postcodeRegex = {
   GB: {
-    pattern: '^[a-z]{1,2}\\d[a-z\\d]?\\s*\\d[a-z]{2}$',
+    pattern: '^[A-Za-z]{1,2}\\d[A-Za-z\\d]?\\s*\\d[A-Za-z]{2}$',
     errorMsg: 'Please enter a valid UK postcode, using a space. For non-UK addresses, please use manual entry below.',
   },
 };