How to replace the html tags with SED command?

Question

I am trying to replace the below tag with the new content along with the tag line. Is there a way we can change the tag along with its values using sed or any other options we have to do this?

Original html Tag (inside th> tag):

th> file-109 /th>
th> file-209 /th>

Change this html tag to:

th>S.No  Name /th>
th>S.No  Name /th>

I tried the below but this doesn't work. Its throwing error.

sed "s/th>file-1.*/'th>`head -5 file-109 | tail -1`/th>'/g" Diff.html
sed "s/th>file-2.*/'th>`head -5 file-209 | tail -1`/th>'/g" Diff.html

Answer 1

Sed can use many different characters as separators; you choosed /, but / is also present in the string you want to substitute. Therefore, I'd choose :

sed 's:th>file-[0-9]+ /th>:th>S.No name /th>:g' yourfile

Please note, however, that if you want to process anything more complex than that, you should parse HTML - and not use regex.

Answer 2

Don't really know how robust it needs to be but try sed -e "s/file-[^/ ]*/S.No Name/g" Diff.html and to edit the file directly use sed -ie

Answer 3

perl -0777pe '
   s{ (?<=th>\s) file-\d+ (?=\s/th>) }{
      qx/sed -e "4q;d" "$&"/ =~ /.*/;
      $&;
   }xge;
' Diff.html

If I understand you correctly, then you want all filenames of the kind File-num enclosed in th> and /th> tags in a file to be replaced by the 4th line of the file just selected.