Form validation number and text only no space mac 4 numbers

Hi all,

How do i valididate for this?

- numbers and text only , no spaces

- max 4 number

    def clean_profielnaam(self):

        data = self.cleaned_data['profielnaam']

        if not re.match(r'^[a-z][0-9]+', data):

            raise forms.ValidationError("Je mag alleen tekst en cijfers gebruiken en geen spaties")

        return data

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