Hi, Thanks for your comments. One more small doubt i have.

here is the input data

<input>
This is to test. this is to test
<p>This is to test. This is
to test</p>
<p>This is to test. This is
to test</p>
This is to test.
this is to test
</input>
[download]

<output>
This is to test. this is to test
<p>This is to test. This is to test</p>
<p>This is to test. This is to test</p>
This is to test.
this is to test
</output>
[download]

i.e. i want to make the <p>...</p> as single line. i mean delete the carrage returns only inside <p>...</p> my following code does the job, but only for the last <p>...</p>. i don't know how to loop it here. pls suggest

$infile = $ARGV[0];

open(IN, '<', "temp.in") || die "\nCan't open temp.in \n";
open(OUT, '>' "temp.out");
$/="";
while(<IN>)
{
    if($_=~s/(.*)&lt;p&gt;(.*)\<\/p\>(.*)//ms)
    {
        $pre =  $1;
        $par =  $2;
        $pos =  $3;

        $par=~s#\n# #ig;
        print OUT "$pre&lt;p&gt;$par\<\/p\>$pos";
    }
}
close(IN);
close(OUT);
[download]

Note: also please let me know how to include the source code in this page, any special tags for that? i mean the code formatting is often getting messed when i post

edited by ybiC: Reformatted to avoid lateral scrolling in browser window - balanced <code>tags around example input+output and code

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