从字符串末尾删除特定字符串

Question

From the end of a string I need to remove specific strings. I could do this with a loop, but I think it should be possible with a regex.

Example: remove all <br>, &nbsp; and whitespace from the end of my input string.

"Hello world<br> <br>&nbsp; &nbsp; "

should become

"Hello world".

I have tried various permutations of

$input = preg_replace('/(<br>| |&nbsp;)*$/', '', $input);

but in the end my regex knowledge fails me. How can I do this?

Answer 1

The regex you've tried works just fine. Setting the Content-Type header to plain might help with debugging:

$string = "Hello world<br> <br>&nbsp; &nbsp; ";
$input = preg_replace('/(<br>| |&nbsp;)*$/', '', $string);
header('Content-Type: text/plain');
var_dump($input);

Outputs:

string(11) "Hello world"

3v4l demo.