Allow dot in wordpress permalinks (only for categories)

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1. Well in case you need to change look of generated permalinks take a look to sanitize_title_with_dashes function which is one of filters of the sanitize_title hook filters.

   If that only one request for this filter (avoid replacing .) you can copy/paste this function with a same name and remove original reference and add new.

       remove_filter('sanitize_title', 'sanitize_title_with_dashes');
   add_filter('sanitize_fitler', 'sanitize_filter_se_119069');
   function sanitize_filter_se_119069($title, $raw_title = '', $context = 'display'){
       $title = strip_tags($title);
       // Preserve escaped octets.
       $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
       // Remove percent signs that are not part of an octet.
       $title = str_replace('%', '', $title);
       // Restore octets.
       $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
   
       if (seems_utf8($title)) {
           if (function_exists('mb_strtolower')) {
               $title = mb_strtolower($title, 'UTF-8');
           }
           $title = utf8_uri_encode($title, 200);
       }
   
       $title = strtolower($title);
       $title = preg_replace('/&.+?;/', '', $title); // kill entities
   
   //  $title = str_replace('.', '-', $title);
   
       if ( 'save' == $context ) {
           // Convert nbsp, ndash and mdash to hyphens
           $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
   
           // Strip these characters entirely
           $title = str_replace( array(
               // iexcl and iquest
               '%c2%a1', '%c2%bf',
               // angle quotes
               '%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',
               // curly quotes
               '%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',
               '%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',
               // copy, reg, deg, hellip and trade
               '%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',
               // grave accent, acute accent, macron, caron
               '%cc%80', '%cc%81', '%cc%84', '%cc%8c',
           ), '', $title );
   
           // Convert times to x
           $title = str_replace( '%c3%97', 'x', $title );
       }
   
       $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
       $title = preg_replace('/s+/', '-', $title);
       $title = preg_replace('|-+|', '-', $title);
       $title = trim($title, '-');
   
       return $title;
   }
   

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