Regex validation with WTForms and python

Replacing the regex with

'^\w+$'

solved the problem.

I know this was answered a long time ago, but another option I discovered to provide alphanumeric validation on WTForms is AlphaNumeric()

from wtforms_validators import AlphaNumeric
...

class SignupForm(Form):
    login_id = StringField('login Id', [DataRequired(), AlphaNumeric()])

More details here https://pypi.org/project/wtforms-validators/

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