UNIX：使用sed消除和替换字符串中的内容吗？

Question

I have a string, lets say:

<lic><ic>This is a string</ic>, welcome to my blog.</lic>

I want to use sed to get rid of the <ic> and </ic> tags, as well as the literal tags <lic> and </lic>

What is the fastest way to do this? I'm very new to sed. How would this be done in awk? I know awk is much better for column-like text, so I feel more inclined to learn how to use sed.

Any help is always appreciated, thanks in advance!

Answer 1

仅删除标签：

sed -i.old -r 's;</?l?ic>;;g' infile

Answer 2

sed -e 's%</\{0,1\}l\{0,1\}ic>%%g'

The \\{0,1\\} is the standard sed way of writing the equivalent of ? in PCRE. The regex uses % to separate bits; then looks for an < possibly followed by a slash, possibly followed by an l , followed by ic> and replaces it with nothing, globally across each line of input.

Some versions of sed allow you to specify alternative systems of regexes, but this works everywhere.

Answer 3

sed doesn't need to be complicated. Here are two simple ways to do what you want.

This matches those exact patterns and removes them globally:

sed -e "s%\\(<lic>\\|</lic>\\|<ic>\\|</ic>\\)%%g" file.txt

Remember, that you can set multiple expressions using sed if necessary:

sed -e "s%<lic>%%" -e "s%</lic>%%" -e "s%<ic>%%" -e "s%</ic>%%" file.txt

Answer 4

Your tags have a structure of a left bracket followed by a number of characters that are not a right bracket and then finally a right bracket. So let's write it that way:

sed 's/<[^>]*>//g'