Re^2: How to print the lines immediately above and below a matching line?

http://www.perlmonks.org?node_id=1005489

in reply to Re: How to print the lines immediately above and below a matching line?
in thread How to print the lines immediately above and below a matching line?

Hi, thanks for your reply.

I am trying to match from the DATA handle.

Comment on Re^2: How to print the lines immediately above and below a matching line? Download Code

Replies are listed 'Best First'.
Re^3: How to print the lines immediately above and below a matching line? by toolic (Bishop) on Nov 25, 2012 at 13:41 UTC
Then you need to change your code. Something like: `my $data = <DATA>; chomp $data; if ($this_line =~ /\Q$data/)` [download]	[reply] [d/l]
Re^4: How to print the lines immediately above and below a matching line? by Bio90 (Initiate) on Nov 25, 2012 at 13:55 UTC
I have tried that but it has returned a `"Use of uninitialised value $data".` I do not understand - surely `$data` is initialised by `my $data = <DATA>;`?	[reply] [d/l] [select]
Re^5: How to print the lines immediately above and below a matching line? by Anonymous Monk on Nov 25, 2012 at 14:00 UTC
Show that code? Where did you add the line?	[reply]
Re^6: How to print the lines immediately above and below a matching line? by Bio90 (Initiate) on Nov 25, 2012 at 14:09 UTC
Re^7: How to print the lines immediately above and below a matching line? by Anonymous Monk on Nov 25, 2012 at 14:32 UTC
Some notes below your chosen depth have not been shown here
Re^3: How to print the lines immediately above and below a matching line? by Anonymous Monk on Nov 25, 2012 at 13:40 UTC
Maybe you should read a line from that handle instead ... don't skip the basics, read perlintro	[reply]
Re^4: How to print the lines immediately above and below a matching line? by Bio90 (Initiate) on Nov 25, 2012 at 13:52 UTC
I'm sorry, I am a Biology student and I have merely had perl suggested to me as a means to an end in order to get my data into a usable format.	[reply]
Re^5: How to print the lines immediately above and below a matching line? by Anonymous Monk on Nov 25, 2012 at 14:01 UTC
I'm sorry, I am a Biology student and I have merely had perl suggested to me as a means to an end in order to get my data into a usable format. Right, and you're merely trying to write a perl program -- might as well learn the basics of the syntax, like what goes in a match operator is not an attempt to read from a filehandle -- you have to separate the steps Are you sure an already written perl program, say something from the bioperl.org website wasn't suggested instead?	[reply]

In Section Seekers of Perl Wisdom