diff --git a/webapp/models.py b/webapp/models.py
index f81f8f7..f60e026 100644
--- a/webapp/models.py
+++ b/webapp/models.py
@@ -119,18 +119,18 @@ class SignupForm(models.Model):
                 }
             elif question_type == "radiobutton":
                 options = q["options"]
-                pattern = ""
-                map(lambda x: pattern.join(f"^{x}$|"), options)
+                regexes = map(lambda x: f"^{x}$", options)
+                pattern = "|".join(regexes)
                 properties[id] = {
                     "type": "string",
                     # Remove last regex or
-                    "pattern": pattern[:-1],
+                    "pattern": pattern,
 
                 }
             elif question_type == "checkbox":
                 options = q["options"]
-                pattern = ""
-                map(lambda x: pattern.join(f"^{x}$|"), options)
+                regexes = map(lambda x: f"^{x}$", options)
+                pattern = "|".join(regexes)
 
                 properties[id] = {
                     "type": "array",
@@ -138,7 +138,7 @@ class SignupForm(models.Model):
                     "maxItems": len(options),
                     "items": {
                         "type": "string",
-                        "pattern": pattern[:-1]
+                        "pattern": pattern
                     }
                 }
             else: raise Exception("invalid question type!")