regex - unexpected end of regular expression in python -

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hello learning web development in came across kind of error, regex code :

def valid_username(self , username):   user_re = re.compile(r"^[a-za-z0-9_-]{3,20}$")   if user_re.match(username):     return username  def valid_password(self, password):   pass_re = re.compile(r"^.{3,20}$")   if pass_re.match(password) :     return password  def valid_email(self, email):   email_re = re.compile(r"^[\s]+@[\s]+\.[\s\+$")   if email_re.match(email):     return email

and error log:

traceback (most recent call last):    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 1511, in __call__      rv = self.handle_exception(request, response, e)    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 1505, in __call__      rv = self.router.dispatch(request, response)    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher     return route.handler_adapter(request, response)    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 1077, in __call__    return handler.dispatch()    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 547, in dispatch    return self.handle_exception(e, self.app.debug)    file "/home/suraj/google_appengine/lib/webapp2-2.3/webapp2.py", line 545, in dispatch    return method(*args, **kwargs)    file "/home/suraj/google_apps/greetings/greetings.py", line 118, in post    valid_email = self.valid_email(email)    file "/home/suraj/google_apps/greetings/greetings.py", line 91, in valid_email    email_re = re.compile(r"^[\s]+@[\s]+\.[\s\+$")    file "/usr/lib/python2.7/re.py", line 190, in compile    return _compile(pattern, flags)   `file "/usr/lib/python2.7/re.py", line 244, in _compile    raise error, v # invalid expression

error: unexpected end of regular expression

help nedded!thanks in advance

you failed put closing ] bracket in email_re = re.compile(r"^[\s]+@[\s]+\.[\s\+$") regex.

re.compile(r"^[\s]+@[\s]+\.[\s]+$")

you don't need character class.

re.compile(r"^\s+@\s+\.\s+$")

\s+ matches 1 or more non-space characters.


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