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回复 #3 LonnyHe 的帖子
info sed
The `s' command is probably the most important in `sed' and has a
lot of different options. Its basic concept is simple: the `s' command
attempts to match the pattern space against the supplied REGEXP; if the
match is successful, then that portion of the pattern space which was
matched is replaced with REPLACEMENT.
The REPLACEMENT can contain `\N' (N being a number from 1 to 9,
inclusive) references, which refer to the portion of the match which is
contained between the Nth `\(' and its matching `\)'. Also, the
REPLACEMENT can contain unescaped `&' characters which reference the
whole matched portion of the pattern space. Finally, as a GNU `sed'
extension, you can include a special sequence made of a backslash and
one of the letters `L', `l', `U', `u', or `E'. The meaning is as
follows:
`\L'
Turn the replacement to lowercase until a `\U' or `\E' is found,
`\l'
Turn the next character to lowercase,
`\U'
Turn the replacement to uppercase until a `\L' or `\E' is found,
`\u'
Turn the next character to uppercase,
`\E'
Stop case conversion started by `\L' or `\U'.
[ 本帖最后由 ywlscpl 于 2010-1-22 10:10 编辑 ] |
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发表于 2010-01-22 09:43
