您还可以preg_match_all用作：
preg_match_all('/((?:^|[A-Z])[a-z]+)/',$str,$matches);
说明：
( - Start of capturing parenthesis.
(?: - Start of non-capturing parenthesis.
^ - Start anchor.
| - Alternation.
[A-Z] - Any one capital letter.
) - End of non-capturing parenthesis.
[a-z]+ - one ore more lowercase letter.
) - End of capturing parenthesis.
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