It’s easy to implement. All you need is your own hook for get_terms_args
filter:
add_filter( 'get_terms_args', 'wpse8170_get_terms_args', 10, 2 );
function wpse8170_get_terms_args( $args, $taxonomies ) {
if ( !in_array( 'post_tag', $taxonomies ) ) {
return $args;
}
$matches = array();
if ( empty( $args['search'] ) || !preg_match( '/^\#(.*)$/', $args['search'], $matches ) ) {
return $args;
}
if ( count( $matches ) == 2 ) {
$args['search'] = '';
$args['include'] = array_filter( array_map( 'intval', explode( '&', $matches[1] ) ) );
}
return $args;
}
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