How to search character U-FFFD (black diamond question mark) in NSString?

问题

I have a problem. I want to change the black diamond question mark (U-FFFD) with white space. How could I search the character (black diamond question mark) so I can change it with white space? Thank you for your attention.

回答1:

[theString stringByReplacingOccurrencesOfString:@"\ufffd" withString:@" "];

回答2:

Solve black diamond with question mark.

just use this:

foreach($disp as $objs)
{

    $objs = preg_replace( '|[^.?,A-Za-z0-9-]+|', ' ', $objs);
    echo $objs;
}

// this will display character (.?A-Z AND 0-9) and replace char other than this.

来源：https://stackoverflow.com/questions/5270534/how-to-search-character-u-fffd-black-diamond-question-mark-in-nsstring