preg_replace working fine on one server, not on another

I have a few preg_replace functions that are working fine on my local test server but not at all on my production server (everything just passes through unchanged.

The first is to convert <span> tags to a different tag, and it goes like this:

[code=php]$post_content = preg_replace(‘|<span class=”(.*)”>(.*)</span>|eis’,'<pstyle:$1>$2<pstyle:Body Text>’,$string);[/code]

On my test server, it takes something like

[CODE]<span class=”test”>this is test text</span>[/CODE]

and turns it into

[CODE]<pstyle:test>this is test text<pstyle:Body Text>[/CODE]

but on my production server it changes nothing.

The next one is to strip out everything between two span tags, and it goes like this:

[code=php]$post_content = preg_replace(‘|<span class=”writely-comment(.*)”>(.*)</span>|eis’,”,$post_content);[/code]

Any thoughts?

Also in #PHP _↴