DjangoのForm用のフィールドクラス。 ハイフン毎にフィールドを分ける様な電話番号入力の時に使うと良いよ。

fields.py

#-*-coding=utf8-*-
from django.utils.translation import ugettext_lazy as _
from django import forms
from django.forms.widgets import MultiWidget


class SplitPhoneNumberWidget(MultiWidget):
    u"""
    電話番号ウィジェット
    [te1]-[te2]-[te3]みたいな感じで入力が出来るよ。
    """
    def __init__(self, size=None, attrs=None):
        self.size = size or (4, 4, 4)
        widgets = (forms.TextInput(attrs={'size':self.size[0], 'maxlength':self.size[0]}),
                   forms.TextInput(attrs={'size':self.size[1], 'maxlength':self.size[1]}),
                   forms.TextInput(attrs={'size':self.size[2], 'maxlength':self.size[2]}))
        super(SplitPhoneNumberWidget, self).__init__(widgets, attrs)

    def format_output(self, rendered_widgets):
        return '-'.join(rendered_widgets)

    def value_from_datadict(self, *args, **kwargs):
        values = super(SplitPhoneNumberWidget, self).value_from_datadict(*args, **kwargs)
        if any(values):
            return u'-'.join(values)
        else:
            return u''

    def decompress(self, value):
        if value:
            return value.split('-')
        return [None for s in self.size]


class SplitHiddenPhoneNumberWidget(SplitPhoneNumberWidget):
    """
    hidden表示用、電話番号ウィジェット
    """
    is_hidden = True

    def __init__(self, *args, **kwargs):
        super(SplitHiddenPhoneNumberWidget, self).__init__(*args, **kwargs)
        for widget in self.widgets:
            widget.input_type = 'hidden'
            widget.is_hidden = True

    def format_output(self, rendered_widgets):
        return ''.join(rendered_widgets)


class PhoneNumberField(forms.RegexField):
    u"""
    電話番号フォーム
    [te1]-[te2]-[te3]みたいな感じの入力を受け付けるよ。
    """
    default_error_messages = {
        'invalid': _('Invalid phone number.'),
    }

    def __init__(self, size=None, *args, **kwargs):
        self.size = size[0:3] or (4, 4, 4)

        widget = kwargs.setdefault('widget', SplitPhoneNumberWidget(self.size))
        if isinstance(widget, SplitPhoneNumberWidget):
            self.hidden_widget = SplitHiddenPhoneNumberWidget

        kwargs['regex'] = ur'\d{2,%d}-\d{2,%d}-\d{2,%d}' % self.size
        kwargs['max_length'] = sum(self.size) + len(self.size) - 1

        super(PhoneNumberField, self).__init__(*args, **kwargs)