[SOLVED] Matching where something is NOT found

[lemmin]

With this string:

<?php
"<img src=\"1.jpg\" /><img src=\"2.jpg\" alt=\"2\" />"
?>

 

I am trying to add a string like "alt=\"1\"" to only the img tag that does NOT already have an alt property

 

This regex matches the src property just like I want it to:

"/(<\s*img\s*src\s*=\s*[\"|'](.+?)[\"|'])/"

 

But when I try to match the end tag without any other characters, it gets greedy and matches the quote from the end of the alt property:

"/(<\s*img\s*src\s*=\s*[\"|'](.+?)[\"|'])\s*\/>/"

 

So, is there a way to implement this regex where the .+? won't match the middle quotes?

 

Or, what is a good way to match the img tag that doesn't have an alt property?

 

I know I could do it with two statements, but it seems like it should be possible with just one.

 

Thanks.

[lemmin]

I guess I should have thought about this harder, I just figured it out:

"/(<\s*img\s*src\s*=\s*[\"|']([^\"]*?)[\"|'])\s*\/?>/"

[effigy]

<pre>

<?php

$data = '<img src="1.jpg" /><img src="2.jpg" alt="2" />';

echo(

htmlspecialchars(

preg_replace('%<img\s+((??!alt=)[^>])*?)\s*/?>%', '<img $1 alt="1" />', $data)

)

);

?>

</pre>

[lemmin]

Yeah, I realized that regex would only work for the strict syntax that my input was using. This would be a more universal way of matching any img tag without an alt property:

/<\s*img(.(?!alt\s*=\s*['\"]))+?\/?>/

 

Thanks for the help.