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samples/build_a_form_with_validatio...

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<h1>Build a form with validation</h1>
<div class="type-label type-label-bordered">cookbook</div>
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<p>By Flutter</p>
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<button class="mdc-button mdc-button--outlined" onclick="window.location.href = 'https://flutter.dev/docs/cookbook/forms/validation.html';"> <span class="mdc-button__ripple"></span>View Recipe</button>
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<a href="./#?search=tag%3Acookbook">cookbook</a>
<a href="./#?search=tag%3Aforms">forms</a>
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<div class="slider-single"><img class="slider-single-image" src="images/cookbook/forms-validation.png" alt="Cookbook article" /></div>
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<div class="description">
<p>Apps often require users to enter information into a text field.
For example, you might require users to log in with an email address
and password combination.</p>
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