将两个preg_replace组合成一个

Question

I want to combine those 2 preg_replace into a single one.For example replace every data-thumb-bg=" with style="background-image: url(' and after that if there is .jpg replace it with .jpg);.

 $input = preg_replace('#data-thumb-bg="#s', 'style="background-image: url(', $input);
 $input = preg_replace('#.jpg#s', '.jpg);', $input); //this must be executed only if a match has been found for above

How can i do that ?

Edit

I think i have wrongly expressed myself

The .jpg should be replaced only if data-thumb-bg= has been replaced.Like first you replace the data-thumb-bg then you replace the .jpg that follow the data-thumb-bg

Kind Regards

Answer 1

I'm assuming your end goal is to change an element's attribute data-thumb-bg="photo.jpg" to style="background-image: url(photo.jpg);". This can be done using a capture group and backreference (note that the s modifier is unnecessary since we don't use a .):

$input = preg_replace('/data-thumb-bg="([^"]+)"/', 'style="background-image: url(\1);"', $input);

RegEx Demo

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If you want to only allow .jpg extensions, you can use this expression:

data-thumb-bg="([^"]+?\.jpg)"

Or if you only want to allow a handful of image extensions, you can use an expression like this:

data-thumb-bg="([^"]+?\.(?:jpe?g|png|gif))"