Linux POSIX character set
[:alnum:] 字母与数字
[:alpha:] 字母
[:blank:] 空格与制表符
[:cntrl:] 控制字符
[:digit:] 数字
[:graph:] 可打印的与可见的(不包括空格)字符
[:lower:] 小写字符
[:print:] 可打印的字符(包括空白)
[:punct:] 标点
[:space:] 空白
[:upper:] 大写字符
[:xdigit:] 十六进制字符
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