validation.dart

    _validator.ruleFor('name', ()=>text)
        ..notEmpty()
        ..withMessage('Please enter a name')
        ..length(2, 30)
        ..withMessage('Please enter a reasonable name');

    _validator.ruleFor('email', ()=>text)
        ..notEmpty()
        ..withMessage('Email cannot be empty')
        ..emailAddress()
        ..withMessage('Enter a valid email');

    _validator.ruleFor('text', ()=>text)
        ..notEmpty()
        ..withMessage('Cannot be empty');

    _validator.ruleFor('phone', ()=>text)
        ..notEmpty()
        ..withMessage('Phone number cannot be empty')
        ..matches('[0-9]{0,14}\$')
        ..withMessage('Phone number doesn\'t seem correct');

    _validator.ruleFor('int', ()=>text)
        ..matches('(?<=\\s|^)[-+]?\\d+(?=\\s|\$)')
        ..withMessage('Enter a valid number');