Get all posts beginning with letter A - wordpress

Question

How can i get all poasts beginning with the letter A (in the post_title)?
My idea was to use regex but this code dont work.
$my_custom_query_args = array(
'cat' => '1',
'post_type' => 'post',
'post_status' => 'publish',
'posts_per_page' => 25,
'offset' => 0,
'value' => '^'.$letter.'',
'compare' => 'REGEXP'
);

Answer 1

Using post_where , this action code be use in custom template.
add_action( 'posts_where', 'startswithaction' );
function startswithaction( $sql ){
global $wpdb;
$startswith = get_query_var( 'A' );
if( $startswith ){
$sql .= $wpdb->prepare( " AND $wpdb->posts.post_title LIKE %s ", $startswith.'%' );
}
return $sql;
}
OR you can get all records starts with letter A by SQL query and pass the post ids in WP_QUERY.
//get all post IDs for posts start with letter A, in title order,
//display posts
global $wpdb;
$first_char = 'A';
$postids = $wpdb->get_col($wpdb->prepare("
SELECT ID
FROM $wpdb->posts
WHERE SUBSTR($wpdb->posts.post_title,1,1) = %s
ORDER BY $wpdb->posts.post_title",$first_char));
if ($postids) {
$args=array(
'post__in' => $postids,
'post_type' => 'post',
'post_status' => 'publish',
'posts_per_page' => -1,
'caller_get_posts'=> 1
);
$my_query = null;
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
echo 'List of Posts Titles beginning with the letter '. $first_char;
while ($my_query->have_posts()) : $my_query->the_post(); ?>
<p><?php the_title(); ?></p>
<?php
endwhile;
}
wp_reset_query();
}