[RESOLVED] problem with inventing pattern for preg_replace

[s1w]

Hello. My problem is about processing Regular Expressions (Perl-Compatible)

as on img:

i've tried a hundreds of patterns, and still nothing

for #1 not working:

'/\..+$/'
'/\..+?$/'
'/\..+?(?!\.)$/'
          \
           yes, this is followed char, I only dont know ifwiem czy
           logic is not inversed by $

for #2

$replace = '/\.[\w\W]+$/';
   $with = '';

preg_replace($replace,$with,$str);

(without returning correct alphanumeric findings for now, but still not working)

others:

'/\.[\w\W^\.]+$/'   

'/\.[\w\W^\.]+?$/'   

'/\.[\w\W[^\.]]+?$/'        

'/\.[\w[\W[^\.]]]+?$/'
'/\.[\w\W&&[^\.]]]+?$/'  //&& working in java, but rather not in php

'/\.(?:\w|\W)+$/'        //or even without []
'/\.(?:\w?|\W?)+$/'  

first idea with returnings:

'/\s*\.[(\w)\W^\.]+?$/'  

'/\.(?:\(w?)|\W?)+$/'

$replacer = '\.$1';

anyone could help me with this?

greetings
michael

[s1w]

<?php
$replace = array('/[\[\{]/', '/[\]\}]/',                //change parenthesis [] {}  na ()
                 '/(.*)\.(.*)$/e',                      //format extension                                    

                 '/[^\w\s\(\)\-`\.,;\+=#&!]|'.          //allow some strange chars in filename _ -() `,.;+=!&#
                 '^[\s\.,;]*[!&\-#]+[\s,;!&\-#]*/',     //format tolerable beggining
                 '/^[\s\.,;]+|\s+(?=\s.)/');            //or cut, and finally shorten multiple spaces
$with = array('(',')',"trim('$1').'.'.preg_replace('~[\W]~','','$2')",'_','');

printt ('file|'.preg_replace($replace,$with,$str).'|'); //own print for debugging
?>