PHP Warning: mb_ereg_replace(): mbregex search failure in php_mbereg_replace_exec(): retry-limit-in-match over in /vendor/vanderlee/php-sentence/src/Multibyte.php on line 59

[splitbrain]

I get above warning for some of my content. The problem happens in the trim() method:

https://github.com/vanderlee/php-sentence/blob/ed7ce41ef815bd21e61f62b692418740f988451f/src/Multibyte.php#L57-L60

When the warning is throw, mb_ereg_replace will return false instead of a string, breaking the rest of the script.

I created a test case to demonstrate the problem: https://github.com/splitbrain-forks/php-sentence/commit/914dd45bf3c77e9c1069e754cf53df911ca66a16

I have no idea why it fails. I'm also not 100% sure why a UTF-8 aware method is needed here. Is it to remove non-ASCII whitespaces like non-breaking or half-width spaces? Would using preg_replace with the /u flag be an alternative?