php正则匹配中文报错，正则如下：
/^[\x{4e00}-\x{9fa5}A-Za-z0-9_]{2,12}$/解决办法，后面少了一个 u ！
/^[\x{4e00}-\x{9fa5}A-Za-z0-9_]{2,12}$/u这样就可以了！
参考博文：
https://blog.csdn.net/zhangfeng1133/article/details/49613879
preg_match(): Compilation failed: character value in \x{} or \o{} is too large at offset 9
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