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Deleting words between tags

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# 1  
Old 11-25-2009
MySQL Deleting words between tags
Hi !!!

I need to write a script(ksh) that deletes any character outside <start> tag and </start> from a file.

For eg:
Code:
$cat file.txt
<start>
ad
bd
</start>
as</start>
<start>
d
e
f
mb<start>mu
g
h
i
</start>
a
b
c
<start>
a
f
g
</start>

Then output should be::
Code:
<start>
ad
bd
</start>
<start>mu
g
h
i
</start>
<start>
a
f
g
</start>

Thanks...
# 2  
Old 11-25-2009
Code:
awk '/<start>/,/<\/start>/' file.txt

# 3  
Old 11-25-2009
It wont work... It'll giv the foll. output.
Code:
<start>
ad
bd
</start>
<start>
d
e
f
mb<start>mu
g
h
i
</start>
<start>
a
f
g
</start>


I guess, its not so simple...
# 4  
Old 11-25-2009
Code:
sed '/<start>/,/<\/start>/ d'

# 5  
Old 11-25-2009
Code:
local $/;
my $str=<DATA>;
my @tmp = split(/(?<=<\/start>)/,$str);
map {/(<start>(?!.*<start>).*<\/start>)/s;print $1,"\n";} @tmp;

__DATA__
<start>
ad
bd
</start>
as</start>
<start>
d
e
f
mb<start>mu
g
h
i
</start>
a
b
c
<start>
a
f
g
</start>

# 6  
Old 11-26-2009
In the OP's desired output this should be left out:
Code:
as</start>
<start>
d
e
f
mb

But what is the criterion here? That <start> should be ignored because there was a previous </start> that did not belong to a <start> before that? I think that would have to be clarified or it is going to be a long thread.
# 7  
Old 11-26-2009
I apologize for the late reply...
The rule here is :: every data lie between the tags <start> and </start>. Ignore all the other data...

For eg::
If we consider the following data::
<start>
ad
bd
</start>
as</start>
<start>
d
e
f
mb<start>mu
g
h
i
</start>
a
b
c
<start>
a
f
g
</start>


The script should discard the data which appers in red(above)::

as</start> --> because this </start> does not have its <start>

<start>
d
e
f
mb --> these lines because </start> is not present.

a
b
c --> Also these lines because these does not lie inside <start> and </start>
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