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请问关于preg_replace替换的有关问题

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Release： 2016-06-13 12:38:55
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请教关于preg_replace替换的问题
字符串  $str = 'aa__cc__ee';
企图使用这样的语句:  preg_replace('/_{2}?/', array('bb', 'dd'), $str);
替换成  'aabbccddee'
但全部换成了bb,我已经在表达式中加了 ? 号表示非贪婪,希望第一次匹配替换完之后不要再把第二个 __ 双下划线替换了,但发现这样不成功,请问怎么办才好?是不是我对贪婪模式理解错误了呢?

Related labels：
array nbsp replace str
source：php.cn
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