Question

I have a bunch of urls in static html files which need to be changed.

They look like this now:

<img src="/foldera/folderb/folderc/images/imgxyz.jpg" />

They need to look like this:

<img src="imgxyz.jpg" />

So, I just wrote a php script that opens each and does a preg_replace().

My regex (with the double escaped backslashes, yes):

$regex = '/<img src="\\/foldera\\/folderb\\/folderc\\/images\\/([^"]*)" \\/>/'

$replacement = '<img src="$0" />' ;

So I am only capturing anything after /images until the closing quote.

But what I get is something like:

<img src="<img src="/foldera/folderb/folderc/images/imgxyz.jpg" />" />

It seems the capture group is overzealous and … or something is not matching with the /foldera/folderb part.

What is going on here?

Answer 1

Use $1 for the replacement. $0 matches the whole pattern. You want the first group.

$replacement = '<img src="$1" />' ;

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An even better way would be to use basename as part of your replacement:

$regex = '/(<img src=")([^"]*)"( \\/>)/e';

$replacement = "stripslashes('\$1').basename(stripslashes('\$2')).stripslashes('\$3')";