escape what it does. 含义
\ Backslash () 反斜杠
' Single-quote (') 单引号
" Double-quote (") 双引号
ASCII bell (BEL) 响铃符
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ASCII backspace (BS) 退格符
ASCII formfeed (FF) 进纸符
ASCII linefeed (LF) 换行符
N{name} Character named name in the Unicode database (Unicode only) Unicode数据库中的字符名;name就是它的名字
ASCII Carriage Return (CR) 回车符
ASCII Horizontal Tab (TAB) 水平制表符
uxxxx Character with 16-bit hex value xxxx (Unicode only) 值为16位十六进制xxxx的字符
Uxxxxxxxx Character with 32-bit hex value xxxxxxxx (Unicode only) 值为32位十六进制xxxx的字符
ASCII vertical tab (VT) 垂直制表符
ooo Character with octal value ooo 值为八进制ooo的字符
xhh Character with hex value hh 值为十六进制数hh的字符
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