How to match content between HTML specific tags with attribute using grep?

Question

Which regular expression should I use with the command grep if I wanted to match the text contained within the tag

and it

Answer 1

Here's one way using GNU grep:

grep -oP '(?<=
 ).*?(?= 
)' file

If your tags span multiple lines, try:

< file tr -d '\n' | grep -oP '(?<=
 ).*?(?= 
)'