BBCODE IMG TAG variations with REGEX - php

Question

I need to convert BBCODE IMG TAG to HTML.
The problem is: the IMG TAG has multiple variations.
[img]img_patch[/img]
[img=200x150]img_patch[/img]
[img width=200 height=150]img_patch[/img]
[img=width=200xheight=150]img_patch[/img]
[img width=200]img_patch[/img]
This regex below cover the First one and the Second one.
'#\[img](.+)\[/img]#Usi',
'#\[img=?(\d+)?x?(\d+)?\](.*?)\[/img\]#Usi',
I need help with the other variations or turning all the variations in an unique REGEX.
I realy apreciate your help!

Answer 1

This should cover all cases:
<?php
$data = <<<DATA
[img]img_patch[/img]
[img=200x150]img_patch[/img]
[img width=200 height=150]img_patch[/img]
[img=width=200xheight=150]img_patch[/img]
[img width=200]img_patch[/img]
DATA;
$regex = '~
(?P<tag>\[img[^][]*\])
(?P<src>.+?)
\[/img]
~x';
$inner = '~\b(?P<key>width|height)?=(?P<value>[^\s\]]+)~';
$values = '~\d+~';
$data = preg_replace_callback($regex,
function($match) use($inner, $values) {
$attr = [];
preg_match_all($inner, $match['tag'], $attributes, PREG_SET_ORDER);
foreach($attributes as $attribute) {
if (!empty($attribute["key"])) $attr[$attribute["key"]] = $attribute["value"];
else {
preg_match_all($values, $attribute["value"], $width_height);
list($attr["width"], $attr["height"]) = array($width_height[0][0], $width_height[0][1]);
}
}
// do the actual replacement here
$attr["src"] = $match["src"];
$ret = "<img";
foreach ($attr as $key => $value) $ret .= " $key='$value'";
$ret .= '>';
return $ret;
},
$data);
echo $data;
?>
And yields
<img src='img_patch'>
<img height='150' width='200' src='img_patch'>
<img width='200' height='150' src='img_patch'>
<img height='150' width='200' src='img_patch'>
<img width='200' src='img_patch'>
The code uses a multi-step-approach: first matching all the tags, then analyzing the attributes. In the end, the new string is formed.
See a demo on ideone.com.
Note: As opposed to your (nickname) son, now you actually do know something, don't you?

Answer 2

Hey Jan I really thank you for your help! Yes, I don't know everything but I do know something. Actually I have created the following REGEX and works fine and covers all IMG TAGs:
'#\[img=(.+)\]#Usi',
'#\[img=+(\d+)x+(\d+)\](.+)\[/img\]#Usi',
'#\[img[\s|=]+[width=]+([0-9]+)?[\s|x]+[height=]+([0-9]+)\](.+)\[/img\]#Usi',
'#\[img[\s]+[width=]+([0-9]+)\](.+)\[/img\]#Usi',
I hope this post may help others on their own projects!