How can I use WP_Query argument ‘Like %..%’?

After another search in WordPress codex I find the solution:

Search Parameter Show posts based on a keyword search.

s (string) – Search keyword. Show Posts based on a keyword search

Display posts that match the search term “keyword”:

$query = new WP_Query( array( ‘s’ => ‘keyword’ ) );

http://codex.wordpress.org/wp_query#Search_Parameter

For my example:

  $resume_args = array();

  $resume_args['post_type'] = 'resume';
  $resume_args['posts_per_page'] = 7;
  $resume_args['paged'] = $paged;

  $resume_args['order'] = 'DESC';
  $resume_args['orderby'] = 'ID';

  $resume_args['s'] = 'foo';

   $resume_search_cat = array(
      'key' => '_resume_category',
      'value' => str_replace('-', ' ',$kategorie),
      'compare' => 'LIKE'
    );

  /** Enable multiple meta query **/
  $resume_args['meta_query'] = array(
    $resume_search_cat
  );

  $resumes = new WP_Query($resume_args);