Удаление с запроса поиска точек, пробелов, символов (метод поиска по сайту)

$string = preg_replace("/[^A-Za-z0-9 ]/", '', $string);

public static function get_main_search_query_sql() {
        global $wp_the_query, $wpdb;
        
        $args         = $wp_the_query->query_vars;
        $search_terms = isset( $args['search_terms'] ) ? $args['search_terms'] : array();
        $sql          = array();
 
        foreach ( $search_terms as $term ) {
            // Terms prefixed with '-' should be excluded.
            $include = '-' !== substr( $term, 0, 1 );
 
            if ( $include ) {
                $like_op  = 'LIKE';
                $andor_op = 'OR';
            } else {
                $like_op  = 'NOT LIKE';
                $andor_op = 'AND';
                $term     = substr( $term, 1 );
            }
 
            $like  = '%' . $wpdb->esc_like( $term ) . '%';
            $sql[] = $wpdb->prepare( "(($wpdb->posts.post_title $like_op %s) $andor_op ($wpdb->posts.post_excerpt $like_op %s) $andor_op ($wpdb->posts.post_content $like_op %s))", $like, $like, $like );
        }
 
        if ( ! empty( $sql ) && ! is_user_logged_in() ) {
            $sql[] = "($wpdb->posts.post_password = '')";
        }
 
        return implode( ' AND ', $sql );
    }

<?php
/**
 * The template for displaying product search form
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/product-searchform.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see     https://docs.woocommerce.com/document/template-structure/
 * @author  WooThemes
 * @package WooCommerce/Templates
 * @version 2.5.0
 */
 
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}
?>
<form role="search" method="get" class="woocommerce-product-search" action="<?php echo esc_url( home_url( '/' ) ); ?>">
    <label class="screen-reader-text" for="woocommerce-product-search-field-<?php echo isset( $index ) ? absint( $index ) : 0; ?>"><?php _e( 'Search for:', 'woocommerce' ); ?></label>
    <input type="search" id="woocommerce-product-search-field-<?php echo isset( $index ) ? absint( $index ) : 0; ?>" class="search-field" placeholder="<?php echo esc_attr__( 'Search products&hellip;', 'woocommerce' ); ?>" value="<?php echo get_search_query(); ?>" name="s" />
    <input type="submit" value="<?php echo esc_attr_x( 'Search', 'submit button', 'woocommerce' ); ?>" />
    <input type="hidden" name="post_type" value="product" />
</form>

<?php echo get_search_query(); ?>

value="<?php echo $str ?> вместо 
 value="<?php echo get_search_query(); ?>

<?php
 
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}
$str = get_search_query();
$str = preg_replace("/[^A-Za-z0-9 ]/", '', $str);
?>
<form role="search" method="get" class="woocommerce-product-search" action="<?php echo esc_url( home_url( '/' ) ); ?>">
    <label class="screen-reader-text" for="woocommerce-product-search-field-<?php echo isset( $index ) ? absint( $index ) : 0; ?>"><?php _e( 'Search for:', 'woocommerce' ); ?></label>
    <input type="search" id="woocommerce-product-search-field-<?php echo isset( $index ) ? absint( $index ) : 0; ?>" class="search-field" placeholder="<?php echo esc_attr__( 'Search products&hellip;', 'woocommerce' ); ?>" value="<?php echo $str ?>" name="s" />
    <input type="submit" value="<?php echo esc_attr_x( 'Search', 'submit button', 'woocommerce' ); ?>" />
    <input type="hidden" name="post_type" value="product" />
</form>