def validate(self, value, model=None, context=None):
regex = self.regex()<EOL>match = regex.match(value)<EOL>if not match:<EOL><INDENT>return Error(self.not_email)<EOL><DEDENT>return Error()<EOL>
Validate
Perform value validation and return result

:param value:           value to check
:param model:           parent model being validated
:param context:         object or None, validation context
:return:                shiftschema.results.SimpleResult