DOS符号转义（转 http://www.robvanderwoude.com/escapechars.php）

Escape Characters
Character to be escaped	Escape Sequence	Remark
%	%%	May not always be required in doublequoted strings, just try
^	^^	May not always be required in doublequoted strings, but it won't hurt
&	^&
<	^<
>	^>
|	^|
'	^'	Required only in the FOR /F "subject" (i.e. between the parenthesis), unless backq is used
`	^`	Required only in the FOR /F "subject" (i.e. between the parenthesis), if backq is used
,	^,	Required only in the FOR /F "subject" (i.e. between the parenthesis), even in doublequoted strings
;	^;
=	^=
(	^(
)	^)
!	^^!	Required only when delayed variable expansion is active
"	""	Required only inside the search pattern of FIND
\	\\	Required only inside the regex pattern of FINDSTR
[	\[
]	\]
"	\"
.	\.
*	\*
?	\?