Rules Problem

I'm not exactly sure why your rule isn't working (though I think you probably want to use the contains operator instead of matches_regex).

I've appended some (sanitized) working 4.x rules that heavily use matches_regex:

 
  load balancing rules 
 rule a { 
    if (http_uri contains "/apack/") { 
       use pool a 
    } 
    else { 
       if (http_uri contains ".cgi") { 
          use pool acgi 
       } 
       else { 
          use pool ahtml      } 
    } 
 } 
 rule b{ 
    if (http_uri contains "/bpack/") { 
       use pool b 
    } 
    else { 
       if (http_uri contains ".cgi") { 
          use pool bcgi 
       } 
       else { 
          use pool bhtml 
       } 
    } 
 } 
 rule c { 
    if (http_uri matches_regex "\/~()(\/|$)") { 
       use pool ccgi 
    } 
    else { 
       use pool cnormalcgi 
    } 
 } 
 rule d { 
    if (http_uri matches_regex "\/~()(\/|$)") { 
       use pool dhtml 
    } 
    else { 
       use pool dcache 
    } 
 } 
 rule e { 
    if (http_uri matches_regex "\/~(frobnosticate)(\/|$)") { 
       use pool ecgi 
    } 
    else { 
       use pool enormalcgi 
    } 
 } 
 rule f { 
    if (http_uri matches_regex "\/fpack\/") { 
       use pool f 
    } 
    else { 
       if (http_uri matches_regex "\.cgi") { 
          if (http_uri matches_regex "^\/~()(\/|$)") { 
             use pool fcgi 
          } 
          else { 
             use pool fnormal 
          } 
       } 
       else { 
          if (http_uri matches_regex "^\/~()(\/|$)") { 
             use pool fhtml 
          } 
          else { 
             use pool fhtmlx 
          } 
       } 
    } 
 } 
  
 rule g { 
    if (http_uri matches_regex "\/~(cola|lemonlime)(\/|$)") { 
       use pool g 
    } 
    else { 
       use pool gcgi 
    } 
 } 
  
 rule h { 
    if (http_uri matches_regex "^\/(~|%7E)(NON-STOP)(\/|$)") { 
       use pool hhtml 
    } 
    else { 
       use pool hcache 
    } 
 } 
 rule i { 
    if (http_uri matches_regex "^/(/|(\./))*ipack/" or http_uri matches_regex "^/(/|(\./))*(~|%7E|%7e).*/ipack(.|..)(bbs|mail|all)/") { 
       use pool i 
    } 
    else { 
       if (http_uri matches_regex "\.cgi($|\?|/|)") { 
          use pool icgi 
       } 
       else { 
          use pool ihtml 
       } 
    } 
 }