Django - Check an integer must to start with 9 and length is 10 with regex

Question

Where is my mistake?

mobile = forms.IntegerField(
    label='Mobile',
    widget=forms.NumberInput(attrs={
        'class': 'form-control',
        'required': 'required'
    }),
    error_messages={
        'invalid': 'Required',
    }
)

def clean_mobile(self):
    mobile = self.cleaned_data['mobile']

    if not re.match('^((?!([0-8]))[0-9]{9})$', str(mobile)):
        self.add_error('mobile', 'Wrong number')

    return mobile

Always returns False!

What is your input? and the length is `9` obviously. Try `^9[0-9]{9}$` — revo, Apr 10 '18 at 23:04

score 2 · Accepted Answer · answered Apr 10 '18 at 23:09

2

In your regex you are looking for a digit which is not in range [0-8] at beginning of input string that literally means 9. Negative lookahead asserts then gives back cursor at position before first character. You then look for 9 digits and end of string which immediately fails on 10 digit numbers.

Try this:

^9\d{9}$

answered Apr 10 '18 at 23:09

revo

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With first 9 length being 10. It works. Thanks dude. – Chalist Apr 10 '18 at 23:11

Django - Check an integer must to start with 9 and length is 10 with regex

1 Answers1