regex101: PCRE (Legacy) Match Workspace

Regular Expression

<\?[\s\S]*?(?:\z|\?\>|[\"\'].*?[\"\'][\s\S]*?\?>)

New

<?php

global $groupcnt;

require('includes/application_top.php');
require('includes/functions/categories_description.php');
require(DIR_WS_CLASSES . 'file_select.php');
require(DIR_WS_CLASSES . 'currencies.php');
$currencies = new currencies();

// RCI code start
echo $cre_RCI->get('global', 'top', false);
echo $cre_RCI->get('categories', 'top', false); 
// RCI code eof 
    
//intilize varibles
$groupcnt = 0; 
$categories_id = '';
$Push = '';
$categories_image = '';
$category_template_id = '';
$categories_previous_image = '';
$extra_field = '';
$parent_name = '';

// array used by the DirSelect class
$ImageLocations['base_dir'] = DIR_FS_CATALOG_IMAGES;
$ImageLocations['base_url'] = DIR_WS_CATALOG_IMAGES; 

// POST GET compatibility
if (isset($_GET['cID'])) {
  $cID = $_GET['cID'] ;
} else if (isset($_POST['cID'])) {
  $cID = $_POST['cID'] ;
} else {
  $cID = '' ;
}
if (isset($_GET['pID'])) {
  $pID = $_GET['pID'] ;
} else if (isset($_POST['pID'])) {
  $pID = $_POST['pID'] ;
} else {

Substitution

<?php

global $groupcnt;

require('includes/application_top.php');
require('includes/functions/categories_description.php');
require(DIR_WS_CLASSES . 'file_select.php');
require(DIR_WS_CLASSES . 'currencies.php');
$currencies = new currencies();

// RCI code start
echo $cre_RCI->get('global', 'top', false);
echo $cre_RCI->get('categories', 'top', false); 
// RCI code eof 
    
//intilize varibles
$groupcnt = 0; 
$categories_id = '';
$Push = '';
$categories_image = '';
$category_template_id = '';
$categories_previous_image = '';
$extra_field = '';
$parent_name = '';

// array used by the DirSelect class
$ImageLocations['base_dir'] = DIR_FS_CATALOG_IMAGES;
$ImageLocations['base_url'] = DIR_WS_CATALOG_IMAGES; 

// POST GET compatibility
if (isset($_GET['cID'])) {
  $cID = $_GET['cID'] ;
} else if (isset($_POST['cID'])) {
  $cID = $_POST['cID'] ;
} else {
  $cID = '' ;
}
if (isset($_GET['pID'])) {
  $pID = $_GET['pID'] ;
} else if (isset($_POST['pID'])) {
  $pID = $_POST['pID'] ;
} else {