How to work with block in loop by using sed?

Question

I have file with some blocks, like this:

<start> test var=3333
<g>test=000000000000 tst <s>
<end>
...
<start> var=564735628
<title>somethink<\title>
<end>
...

And I need to get block between and sections in a loop. And then I need to get some simbols in the current block. I try to do like this:

for block in $(cat $file | sed -n '/<start>/,/<end>/p;'); do
         echo $block 
done

Result is:

<start>

instead

<start> test 1
<g>test=000000000000 tst <s>
<end>

How can I get the entire block for further processing?

---

Ok, I try to explain Source is

<start> test var=3333
<g>test=000000000000 tst <s>
<end>

Result of yours code is not a block. It is just a sting. The string is <end>t> test var=3333tst <s> As can you see it is overlaping strings of the block on each other.

Answer 1

One sugession, do not used sed here. Use languages like perl or python which gives modules for parsing HTML and XML.