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I am trying to open a file using file handle,
Now I know a particular line saying expression X(not the line number),and now I want to search using this an want to format and save it into a variable.

How can i do that

Thanks in advance
+ Harit Himanshu

It's not very clear to me

It's not very clear to me what you're trying to accomplish:

do you want to store into a variable all the lines from a file that match a given regular expression?

If that is what you want you can do something like this:

my @results;
while ( <FILE> )
   push @results, $_ if ( /regular-expression/ );