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  • Difference between regex [Az] and [a-zA-Z] 6 answers

    • Because 

    [A-z0-9]+ 
 ↑ ↑

    is from A to z , see the ASCII table, ] appears between the two characters:

    在这里输入图像描述

    A===>64
z===>122
[===>91

    所以它在你定义的范围之间。使用[A-Za-z0-9]+

    您可以使用/[a-z0-9]+/i （ i使其不区分大小写）或/[A-Za-z0-9]+/ 。

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