Update app.py

app.py

@@ -5,6 +5,7 @@ from Home import dashboard
 import pymongo
 from dotenv import load_dotenv
 import os
+import re
 
 load_dotenv()
 
@@ -26,12 +27,21 @@ try:
 except Exception as e:
     print(e)
 
-
+def validate_email(email):
+  """Validates the format of an email address."""
+  email_regex = r"[a-zA-Z0-9.+_-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"
+  if not re.match(email_regex, email):
+    return False
+  return True
 
 
 def login():
     st.write("Login")
-    username = st.text_input("Username")
+    username = st.text_input("Email")
+    if validate_email(username):
+        st.success("The email address is valid.")
+    else:
+        st.error("The email address is not valid.")
     password = st.text_input("Password", type="password")
     if st.button("Login"):
         if username in col.find():
@@ -44,7 +54,7 @@ def login():
             
 def register():
     st.write("Register")
-    username = st.text_input("Username")
+    username = st.text_input("Email")
     password = st.text_input("Password", type="password")
     data = {
         "Username": username,