This Code Snippet modifies the Wordpress Search Terms

blocksy-ajax-search.php

<?php
function search_replacement($term){
	return ltrim(str_replace( array('0x'), array('0 x '), urldecode(strtolower($term)) ));
}

// ajax search:
function replace_search( $query_object )
{
	if( $query_object->is_search() ) {
		$raw_search = $query_object->query['s'];
		$query_object->set( 's', search_replacement($raw_search) );
	}
}
add_action( 'parse_query', 'replace_search' );

// regular search:
function replace_regular_search( $q ) {
	if ( $q->is_main_query() && $q->is_search() && ! is_admin() && !empty($q->query["s"])) {
		$q->set("s",search_replacement($q->query["s"]));
	}
}
add_action('pre_get_posts', 'replace_regular_search');