linux - Shell script translate single into multiple lines based on a parameter -

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i try write shell scrip following data

input file page.txt content:

enter first page title<br><div style="margin-left: 40px;">enter first point <br></div><div style="margin-left: 80px;">enter second point<br></div><div style="margin-left: 120px;">enter third point<br></div><div style="margin-left: 80px;"><br></div><div style="margin-left: 40px;"><br></div><div style="margin-left: 40px;"><br></div>

algorithm :

read pages file replace <br> newline replace <div style="margin-left: 40px;"> 1 tab  replace <div style="margin-left: 80px;"> 2 tab replace <div style="margin-left: 120px;"> 3 tab replace <div style="margin-left: 160px;"> 4 tab

i trying use 

tr '<br>' '\n' < page.txt

expected output file

enter first page title     enter first point          enter second point             enter third point

please tell tell how write script mentioned above..

i don't handle xml tags without parser, in specific case data seems weird (bad formed) , option evaluate replacement string in substitution command tool solution.

i use 3 substitution commands, first 1 replace <br> newlines, second 1 remove close div tags, , third 1 open div tags, extract number of attribute , use calculate how many tabs insert:

perl -pe '     s/<br>/\n/g;      s{</div>}{}g;      s{\q<div style="margin-left: \e(\d+)\s*\qpx;">}{"\t" x ($1/40)}ge ' infile

it yields:

enter first page title     enter first point          enter second point             enter third point

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