PHP - 'preg_replace regex' all images' URL

Question

I tried to replace all image URLs with an other image URL but I didn't success to correctly write the regex.

My images are not necessarily in an img tag with src="".

It is mostly enclosed with ="image url"

Content to replace for example:

[side_section poster="image.jpg" position="left" bgrepeat="no-repeat" bgcolor="#f6f6f6" paddingtop="70" paddingbot="70" txtcolor="" ]

$content = (string) preg_replace('/(?[!=")(http:\\/\\/.+(png|jpeg|jpg|gif|bmp))/Ui', './images/placeholder.png', (string) $content);

Can you provide some sample URLs, and show us what you expect ? — Adam Sinclair
– Adam Sinclair, Commented Sep 28, 2014 at 22:46
I'm worried when I see (?[!="). Try to use an online tool like regex101.com. I'm also a bit worried about the random type casts you make. — HamZa
– HamZa, Commented Sep 28, 2014 at 22:48
I know I'm really not good at that. My image will always be like that: [... ="image.jpg" ...] — freaky
– freaky, Commented Sep 28, 2014 at 22:49

Adam Sinclair · Accepted Answer · 2014-09-28 23:15:56Z

2

Here is what you need:

$content = '[side_section poster="image.jpg" position="left" bgrepeat="no-repeat" bgcolor="#f6f6f6" paddingtop="70" paddingbot="70" txtcolor="" ]';
$newContent = (string) preg_replace('/="([^"]*\.(?:png|jpeg|jpg|gif|bmp))"/', '="./images/placeholder.png"', (string) $content);
echo $newContent;

The regex used is: ="([^"]*\.(?:png|jpeg|jpg|gif|bmp))"

You can test the it here: DEMO

However the string that you use to replace your image paths should look like this: '="./images/placeholder.png"'

As an alternative use this function:

function replaceImg($content, $path)
{
    return (string) preg_replace('/="([^"]*\.(?:png|jpeg|jpg|gif|bmp))"/', '="'.$path.'"', (string) $content);
}

example:

$content = '[side_section poster="image.jpg" position="left" bgrepeat="no-repeat" bgcolor="#f6f6f6" paddingtop="70" paddingbot="70" txtcolor="" ]';
echo replaceImg($content, './images/placeholder.png');

OUTPUT

[side_section poster="./images/placeholder.png" position="left" bgrepeat="no-repeat" bgcolor="#f6f6f6" paddingtop="70" paddingbot="70" txtcolor="" ]

example 2:

$content = 'position="left" poster="image.jpg"';
echo replaceImg($content, './images/placeholder.png');

OUTPUT

position="left" poster="./images/placeholder.png"

edited Sep 28, 2014 at 23:15

answered Sep 28, 2014 at 22:56

Adam Sinclair

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2 Comments

Casimir et Hippolyte Over a year ago

instead of using .* use [^"]* otherwise something like position="left" poster="image.jpg" will give you wrong results.

freaky Over a year ago

it don't works with attribute before: test1="something" test2="image.jpg"

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