url rewriting - Wordpress Rewrite URL not working with rewrite_rules_array filter -

i have in functions.php (wp 4.6.x) rewrite long pretty urls shorter permalinks posts set $home/ ...

function kl_add_query_vars($avars) {     $avars[] = "urlklcity";     $avars[] = "urlklarea";     $avars[] = "urlcatslug";      $avars[] = "urlcategory";      $avars[] = "urlphonenumber";      //echo "in kl_add_query_vars";     return $avars; }  // hook add_query_vars function query_vars add_filter('query_vars', 'kl_add_query_vars');  function kl_add_rewrite_rules($arules)  {     // matches {home}/{1}/{2}/[3] , nothing else search urls     //$anewrules = array('([^/]+)/([^/]+)/([^/]+)/([^/]+)/([^/]+)?   $'=>'/index.php??       page_id=13988&urlklcity=$matches[1]&urlklarea=$matches[2]&urlcatslug=$matches[3]',     $anewrules = array('([^/]+)/([^/]+)/([^/]+)?$' => '/index.php?page_id=13988&urlklcity=$matches[1]&urlklarea=$matches[2]&urlcatslug=$matches[3]');     //echo 'found url pattern '.$matches[1].' - '.$matches[2];     $arules = $anewrules + $arules;      // #oldrule     //$anewrules = array('([^/]+)/([^/]+)/([^/]+)/([^/]+)/([^/]+)/?$' => '/index.php?page_id=13988&urlklcity=$matches[1]&urlklarea=$matches[2]&urlcatslug=$matches[3]');      // #newrule     $anewrules = array('([^/]+)/([^/]+)/([^/]+)/([^/]+)/([^/]+)/?$' => '/index.php?pagename=$matches[5]');     $arules = $anewrules + $arules;     return $arules; }  // hook add_rewrite_rules function rewrite_rules_array add_filter('rewrite_rules_array', 'kl_add_rewrite_rules'); 

interestingly, oldrule works , redirects intended page.

problem newrule gives 404

• i have tested site works index.php?pagename=xxx manually

• i hardcoded postname in newrule , works too!!

• i have debugged using rewrite analyzer plugin shows should work.

any helpful pointers appreciated.