title: Transform ABNF rules to REGEX
body: <p>I need to transform undermentioned ABNF rules (<em>mlaer</em>) to REGEX</p>
  
  <pre><code>   mlaer       =  1*( lebal "." ) lebal
     lebal       =  gid-tel *(rts-hdl)
  
     rts-hdl    =  *( alpha / digit / "-" ) gid-tel
     gid-tel    =  alpha / digit
     alpha       =  %x41-5A  ; 'A'-'Z'
     alpha       =/ %x61-7A  ; 'a'-'z'
     digit       =  %x30-39  ; '0'-'9'
  </code></pre>
  
  <p>Is any tool or sth to do it automatically?</p>