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This module provides two classes: URL and Email. Both these classes behave exactly the same as the web.form.field.typed.String class except that they only accept as values strings that are URLs or Emails respectively.
For example:
>>> import web.form.field.extra as field
>>> email = field.Email(name='emailField')
>>> print email.html()
<input type="text" name="emailField" value=""> <small>eg. james@example.com</small>
>>> email.value = 'this is not an email address'
>>> email.valid()
0
>>> print email.error()
Please enter a valid email address. eg. james@example.com
>>> email.setError('')
>>> email.value = 'james@example.com'
>>> email.valid()
1
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