Why my regex accept also letters? ^[0-9\-\+_ ]

Question

Why my regex accept also letters? For example:

• test123 - it works (displays error message)

• 123abc - not working (does not display error message)

  test = forms.RegexField(
      max_length=15,
      regex=r'^[0-9\-\+_ ]',
      error_message=_(u"Only digits0-9 and +, _, -"),
      required=True,
      label=_(u'Test'))
  

It should accept string consisting of 0-9 and these special chars: +, _,-," "(space)

Answer 1

Your regex is only testing the start of the string - in fact it is only testing the first character of the string. If [0-9\-\+_ ] is all you want in the whole string then stick a +$ at the end:

regex=r'^[0-9\-\+_ ]+$'

This says that the whole string, start to finish, is only allowed to contain the characters inside the square brackets.