[英]Multiline replace with sed - Linux/Ubuntu
Original file looks like this: 原始文件如下所示:
BLABLA ABCABC blabl=
a blabla blabla ABC=
ABC blabla blabla A=
BCABC blabla
The result should look like: 结果应如下所示:
BLABLA DEFDEF blabl=
a blabla blabla DEF=
DEF blabla blabla D=
EFDEF blabla
So all ABCABC
should be replaced by DEFDEF
, even if there is a linebreak (marked with =
) in the word. 因此,即使单词中有换行符(用
=
标记),所有ABCABC
都应替换为DEFDEF
。
Is it possible with sed? sed有可能吗?
Sed multiline that works for hyphenating ABCABC
at an arbitrary position: sed多行,用于在任意位置将
ABCABC
连字符:
$ sed -r 'N;s/A(=\n)?B(=\n)?C(=\n)?A(=\n)?B(=\n)?C/D\1E\2F\3D\4E\5F/g;P;D' infile
BLABLD AEFDEF blabl=
a blabla blabla DEF=
DEF blabla blabla D=
EFDEF blabla
N;P;D
is the idiomatic way of keeping two lines at a time in the pattern space. N;P;D
是在模式空间中一次保留两行的惯用方式。 The substitution checks for ABCABC
optionally interspersed with =
and a newline at any position, and the substitution inserts back what was captured. ABCABC
的替换检查可选地在任意位置插入=
和换行符,然后替换插入捕获的内容。
This requires extended regular expressions ( -E
in BSD sed) for the ?
这需要为
?
扩展正则表达式(在BSD sed中为-E
) ?
operator. 运营商。 GNU sed supports
\\?
GNU sed支持
\\?
in BRE as an extension, though, but all the ()
would have to be escaped as well. 尽管在BRE中作为扩展名,但是所有
()
也必须转义。
In case the =
just symbolizes a newline and isn't actually there, this simplifies to 如果
=
只是表示换行符而实际上并不存在,则可以简化为
$ sed -r 'N;s/A(\n?)B(\n?)C(\n?)A(\n?)B(\n?)C/D\1E\2F\3D\4E\5F/g;P;D' infile
BLABLA DEFDEF blabl
a blabla blabla DEF
DEF blabla blabla D
EFDEF blabla
好吧,它不是多行的,但是可以解决您的示例:
sed -r -e 's/ABC/DEF/g' -e 's/AB=/DE=/g' -e 's/A=/D=/g' -e 's/^BC/EF/g' -e 's/^C/F/g' infile
尝试这个,
sed -i -e "s/ABC/DEF/g;s/A/D/g;s/B/E/g;s/C/F/g" filename.txt
Using gnu awk with null RS
you can do this in single replacement (using gensub
): 将gnu awk与null
RS
一起使用,可以一次替换(使用gensub
):
awk -v RS= '{
print gensub(/A(=\n)?B(=\n)?C(=\n)?A(=\n)?B(=\n)?C/, "D\\1E\\2F\\3D\\4E\\5F", "g", $0)
}' file
Output: 输出:
BLABLA DEFDEF blabl=
a blabla blabla DEF=
DEF blabla blabla D=
EFDEF blabla
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