While loop repeat

[MasterJediKnight7]

Could you please edit your message with python in brackets [].
It would be much easier to read because We can see where are the if or while loops.
With(without the "" and the spaces between python and the brackets):
"[ python ]"
"[ /python ]"

---

I didn't know the existence of the "re.search" function.
But here is something simple that works (I didn't write the whole alphabet):

ar=['a','b','c','d','e','f','g']
def password_1(x):
    i=0
    while password == ' ':
        print("Please enter a valid password")
    while i<len(password) and (password[i] in ar):
        i+=1
    if i>len(password)-1:
        print("valid")
    else:
        print("invalid")
password = input("Please enter your password: ")
password_1(password)