Trim unicode whitespace in PHP 5.2

Question

How can I trim a string(6) " page", where the first whitespace is a 0xc2a0 non-breaking space?

I've tried trim() and preg_match('/^s*(.*)s*$/u', $key, $m);.

Another question: How can I reliably copy these characters? They seem to be converted to "normal" spaces, which makes it hard to debug.

Answer 1

preg_replace('/^[pZpC]+|[pZpC]+$/u','',$str);