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php正则表达式 看不懂,请指导

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2016-06-13 11:44:43934browse

php正则表达式 看不懂,请指点
从程序代码证找出标示符[A-Za-z_][A-Za-z_0-9]*.

请问如何在代码中中写?我不知道这样的代码如何写?请给个小例子看看。

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