在不同行的两个字符串之间提取文本 [英] Extract text between two strings on different lines
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问题描述
我有一个很大的电子邮件文件,其中包含以下随机主机:
I have a big email file with the following random hosts:
......
HOSTS: test-host,host2.domain.com,
host3.domain.com,another-testing-host,host.domain.
com,host.anotherdomain.net,host2.anotherdomain.net,
another-local-host, TEST-HOST
DATE: August 11 2015 9:00
.......
主机总是用逗号分隔,但是它们可以拆分成一行,两行或多行(不幸的是,我无法控制,这是电子邮件客户端所做的事情.)
The hosts are always delimited with a comma but they can be split on one, two or multiple lines (I can't control this, it's what email clients do, unfortunately).
因此,我需要提取字符串"HOSTS:"和字符串"DATE:"之间的所有文本,将其包装,并用新行替换逗号,如下所示:
So I need to extract all the text between the string "HOSTS:" and the string "DATE:", wrap it, and replace the commas with new lines, like this:
test-host
host2.domain.com
host3.domain.com
another-testing-host
host.domain.com
host.anotherdomain.net
host2.anotherdomain.net
another-local-host
TEST-HOST
到目前为止,我想到了这一点,但是我丢失了与主机"相同的所有内容:
So far I came up with this, but I lose everything that's on the same line with "HOSTS":
sed '/HOST/,/DATE/!d;//d' ${file} | tr -d '\n' | sed -E "s/,\s*/\n/g"
推荐答案
类似的方法可能对您有用:
Something like this might work for you:
sed -n '/HOSTS:/{:a;N;/DATE/!ba;s/[[:space:]]//g;s/,/\n/g;s/.*HOSTS:\|DATE.*//g;p}' "$file"
故障:
-n # Disable printing
/HOSTS:/ { # Match line containing literal HOSTS:
:a; # Label used for branching (goto)
N; # Added next line to pattern space
/DATE/!ba # As long as literal DATE is not matched goto :a
s/.*HOSTS:\|DATE.*//g; # Remove everything in front of and including literal HOSTS:
# and remove everything behind and including literal DATE
s/[[:space:]]//g; # Replace spaces and newlines with nothing
s/,/\n/g; # Replace comma with newline
p # Print pattern space
}
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