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PHP 如何使用正则表达式替换一部分内容？

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  •   showecho · Jun 27, 2018 · 3009 views
    This topic created in 2937 days ago, the information mentioned may be changed or developed.
    比如 $str='111aabbc111ddxxx111555444111';

    我要把中间两个 111 替换成 1+1+1+，前后 111 不变；

    思来想去没有好办法，
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