Wsrtjtyk

I have a .php file which is actually an SVG file with some inline PHP code. Lets call it inner.php :

<?php 

    $uuid = uniqid();

?>

<svg class="__combo" id=<?php echo $uuid ?>

...

</svg>

I am writing another php file which should emit the content of inner.php but with all instances of <?php ... ?> replaced by some string ( for example "AA").The file (lets call it outer.php) looks like this now :

    <?php 

        $svg_body = file_get_contents("inner.php"));

        $replaced = preg_replace("??","AA" , $svg_body);



        echo "$replaced"

    ?>

I marked with "??" the part where I would like to put a regular expression to contain any string starting with "<?php" and ending with first occurrence of "?>". And the output I expect to see is

    "AA"

    <svg class="__combo" id="AA"

    ...

    </svg>

Basically, I dont find a way to escape string containing the <?php and ?> in PHP

This expression seems to work fine...

preg_replace('/<?(phps|=).*?>/siU', '"AA"', $svg_body);

Demo ~ https://3v4l.org/0Ci9d

To break it down...

• 
  <?(phps|=) - a literal match for "<?php" (question-mark escaped) followed by a whitespace character (could be newline) or the short-echo <?=
  


• 
  .* - zero or more characters


• 
  ?> - a literal match for "?>"
  


• 
  s - sets * to match over newlines, required for your first <?php ... ?> block


• 
  i - case-insensitive because why not


• 
  U - ungreedy. Means * matches stops at the first following pattern, not the last. This is to prevent * from matching everything between the first "<?php" and the last "?>"
  

See here for more information on the modifiers ~ http://php.net/manual/reference.pcre.pattern.modifiers.php

An alternative is using PHP's parser via the tokenizer Extension:

<?php



$tokens = token_get_all("<svg>n<?php echo; ?></svg>");



$result='';

$in_php = false;

foreach ($tokens as $token) {

   if ($token[0]==T_INLINE_HTML) {

     $result .= $token[1];

     $in_php = false;

   } else if (!$in_php) {

     $result .= "AAA";

     $in_php=true;

    }

}



echo $result;

https://3v4l.org/jEpYi

This has the benefit, that it also handles other open tags, like <?= and files without closing tag. And handles cases where the closing tag also appears in PHP code (I.e. in a comment)

Try doing this without RegEx first. You may try with substr_replace.

$replaced = substr_replace($svg_body, 'AA', strpos($svg_body, '<?php'), strpos($svg_body, '?>'));

if you really need RegEx then try something like this:

$replaced = preg_replace(/(<?php[sS]+??>)/, "AA", $svg_body);