<?php

// miken32's approach
function ma_post_title_filter($where, &$wp_query) {
    global $wpdb;
    $punct = ["’", "‘", "”", "“"];
    if ( $search_term = $wp_query->get( 'ma_search_post_title' ) ) {
        // escape any % or _ characters
        $search_term = $wpdb->esc_like($search_term);
        // replace desired punctuation characters with _
        $search_term = str_replace($punct, "_", $search_term);
        // do final escaping for safe queries
        $search_term = $wpdb->real_escape($search_term);
        // this looks much neater with string interpolation vs concatenation
        $where .= " AND $wpdb->posts.post_title LIKE '%$search_term%'";
    }
    return $where;
}

$args = array(
    'ma_search_post_title' => $search_term, // search post title only
    'suppress_filters' => FALSE, // this is required for the 'ma_post_title_filter' to work
    'numberposts' => 5,
    'post_type' => 'any',

    'fields' => 'ids',
    'ignore_sticky_posts' => true,
    'no_found_rows' => true,
);

add_filter( 'posts_where', 'ma_post_title_filter', 10, 2 );
$posts = get_posts($args);
remove_filter( 'posts_where', 'ma_post_title_filter', 10 );

print_r($posts);