使用正则表达式在python web.py表单验证中验证密码

Question

I am using python web.py framework for designing small web application, and trying to validate password field with concept that Password length must be more than five characters.

According to the web.py framework we can write regex for validating password field and below is my code

render = web.template.render('templates/')


urls = (
  '/login',   'Login',
  '/projects',  'Projects',
  '/project_details',  'Project_Details',  
)

app = web.application(urls, globals())
vpass = form.regexp('Must be more than 5', lambda x:int(x)>5)

class Login:

        login_form = form.Form( 
        form.Textbox('username', form.notnull),
        form.Password('password',vpass, description="Password"),
        form.Button('Login'),
        )

    def GET(self):
        form = self.login_form()
        return render.login(form)

    def POST(self):
        if not self.login_form.validates():
            return render.login(self.login_form)

if __name__ == "__main__":
    web.internalerror = web.debugerror
    app.run()  

But when i click on login button no message is displaying on browser " password length must...... " .

Whether above regex working ?

How to implement password validation in web.py frameowrk

Answer 1

You want to use a Validator , not a rexexp object:

vpass = form.Validator('Must be more than 5 characters', lambda x:len(x)>5)

A rexexp object expects a python regular expression as the first argument, and an error message as the second argument. A password validating regular expression would be something like:

vpass = form.regexp('.{6,}', 'Must be at least 6 characters')