PHP Regular Expression to replace html img tag with [IMG]

Question

I have the following regular expression to replace an html img tag with [IMG];

echo preg_replace('/(^<img) (.*) (>$)/i', '[IMG]', $subject);

It works as expected to a certain extent, however some of the img tags I'm working end with '/>' and some end with '>'. I can't get the above to work with the latter.

Sample 1 (works):

<img src="image-1.gif" alt="image-1" width="175>" height="80" />

Sample 2 (doesn't work)

<img src="image-2.gif" width="77" height="51" alt="image-2">

Appreciate the help.

That's why regular expressions are not optimal for parsing PHP. Consider using a HTML parser instead. Best methods to parse HTML with PHP — Pekka
– Pekka, Commented Sep 19, 2011 at 14:22
Is sample 1 itentionally corrupt HTML or did you mean ...width="175" height="80" />? — cypher
– cypher, Commented Sep 19, 2011 at 14:24

Alex · Accepted Answer · 2011-09-19 14:37:45Z

1

Although Pekka is right to say you should use an HTML parser (I completely agree), for education's sake, you can use the 'optional' character, ?, which marks the previous character as optional:

echo preg_replace('/(^<img) (.*)(\\\?>$)/i', '[IMG]', $subject);

Notice \\\?. We escape the backslash and question marl (with a backslash) and then say 'this character is optional'.

edited Sep 19, 2011 at 14:37

answered Sep 19, 2011 at 14:26

Alex

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1 Comment

Alex Over a year ago

My bad, needed an extra escape. Works now.

Shai Mishali · Accepted Answer · 2011-09-19 14:26:53Z

0

I would suggest fetching the URL and then manually writing the [IMG] tag.

e.g.

preg_match('/src="(.*?)"/', '<img src="image-2.gif" width="77" height="51" alt="image-2">', $matches)
echo '[IMG]'.$matches[1].'[/IMG]';

Shai.

answered Sep 19, 2011 at 14:26

Shai Mishali

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Comments

David Weitz · Accepted Answer · 2011-09-19 14:29:22Z

0

I would try to use a DOM parser. They're much more reliable.

http://simplehtmldom.sourceforge.net/

answered Sep 19, 2011 at 14:29

David Weitz

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1 Comment

Gordon Over a year ago

Suggested third party alternatives to SimpleHtmlDom that actually use DOM instead of String Parsing: phpQuery, Zend_Dom, QueryPath and FluentDom.

Harsh Patel · Accepted Answer · 2021-09-15 05:10:20Z

for example we have string like this :- $str = 'Text <img src="hello.png" > hello <img src="bye.png" /> other text.

so then we can do replace img tag like below

STEP 1

$str = 'Text <img src="hello.png" > hello <img src="bye.png" /> other text.';
if(preg_match("/(<img .*>)/i", $str)){
     $img_array = preg_split('/(<img .*>)/i', $str, -1, PREG_SPLIT_DELIM_CAPTURE);
}

This will output:

array(5) {
  [0]=>
  string(5) "Text "
  [1]=>
  string(22) "<img src="hello.png" >"
  [2]=>
  string(7) " hello "
  [3]=>
  string(21) "<img src="bye.png" />"
  [4]=>
  string(12) " other text."
}

STEP 2 then we will to do replace in for loop

for ($i = 0; $i < count($img_array); $i++){
     $url = "welcome.png";
     $img_array[$i] = preg_replace('/(<img .*>)/i', '<img src="'.$url.'" alt="'.$url.'">', $img_array[$i]); //replace src path & alt text
}

STEP 3 then after convert array to string

$str = implode('', $img_array);

then after you will get final output like this

$str = 'Text <img src="welcome.png" > hello <img src="welcome.png" /> other text.';

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