Regex to catch what user has put in text box

[robertkwild]

hi all,

this is a small snippet from my python flask-wtf code

class PasswordForm(FlaskForm):
    un = StringField('Username', [InputRequired(message='please enter your Username')])
    op = PasswordField('Current Password', [InputRequired(message='please enter your current password')])
    np = PasswordField('New Password', [InputRequired(message='please enter your new password'), EqualTo('cnp', message='must match confirm new password'), Length(min=12), Regexp('.*[a-z]', message='must contain one lower case'), Regexp('.*[A-Z]', message='must contain one upper case'), Regexp('.*[0-9]', message='must contain one number'), Regexp('.*[\¬\!\"\£\$\%\^\&\*\(\)\_\+\`\-\=\{\}\:\@\~\<\>\?\[\]\;\'\#\,\.\/\\\|]', message='must contain one special character')])
    cnp = PasswordField('Confirm New Password')

i want to make another regex in the “np” to catch “un” and if it contains there username to not allow it

there username is

firstname.lastname

so if they type in either there firstname and or lastname it wont allow it

is this easy to do please

thanks,
rob