php explode string with Uppercase if lowercase letter exists before it without space

问题

$str="Hello MotoBell RingsKing Speech";

I need explode this string by uppercase letter if lowercase letter exists before it.

like this:

$splitted=array(
      0=>"Hello Moto",
      1=>"Bell Rings",
      2=>"King Speech"
     );

any ideas?

I try use that reg_ex, but not working:

$pieces = preg_split('/(?=[A-ZА-Я])/u', $str, -1, PREG_SPLIT_NO_EMPTY);

回答1:

var_dump(preg_split('/(?<=[a-z])(?=[A-Z])/', 'Hello MotoBell RingsKing Speech'))

// array(3) {
//   [0]=>
//   string(10) "Hello Moto"
//   [1]=>
//   string(10) "Bell Rings"
//   [2]=>
//   string(11) "King Speech"
// }

来源：https://stackoverflow.com/questions/24951067/php-explode-string-with-uppercase-if-lowercase-letter-exists-before-it-without-s