Filtering posts by WORD in custom field

args = array(
    'post_type' => 'product',
    'meta_query' => array(
        array(
            'key' => 'brand',
            'value' => 'crocs',
            'compare' => 'LIKE'
        )
    )
 );
$query = new WP_Query( $args );

http://codex.wordpress.org/Class_Reference/WP_Query

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