like
/ (? = (YYYY | YY | MM | DD | HH | mm | ss | ms))\ 1 ([:\ /] *) /
and
/ (YYYY | YY | DD | HH | mm | ss | ms) ([:\ /] *) /
?=, I don"t know what"s the obvious difference between the two. Is there a great god who can answer it?
the original code is as follows:
advance assertion
Syntax: (? = pattern)
case: matches the string x, but x must be followed by y
http://blog.sina.com.cn/s/blo.
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