[Python] Custom validators in WTForms using Flask

I need to make a custom validator in WTForms where the input is to be: number:number - e.g. 2:1

match1 = StringField('Russia-Saudi Arabia', validators=[DataRequired()])


So, my question is - how to create such validator?

I've looked upon the documentation at http://wtforms.readthedocs.io/en/latest/validators.html, but was not very helpful (for me) in this case.

Thanks in advance

Continue reading...