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回复 7# 20032007
info sed
`/REGEXP/'
This will select any line which matches the regular expression
REGEXP. If REGEXP itself includes any `/' characters, each must
be escaped by a backslash (`\').
The empty regular expression `//' repeats the last regular
expression match (the same holds if the empty regular expression is
passed to the `s' command). Note that modifiers to regular
expressions are evaluated when the regular expression is compiled,
thus it is invalid to specify them together with the empty regular
expression.
s/// 就是 s/aaa[13]\s*// |
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