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正则表达式,该怎么处理

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Jun 13, 2016 pm 01:40 PM

nbspreplacetestthis

正则表达式
this is test

把is 替换成 a 但 this不能变

------解决方案--------------------
echo preg_replace('/\bis\b/', 'a', 'this is test');//this a test

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