Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

Re^3: get n lines before a pattern

by VinsWorldcom (Vicar)
on Jul 25, 2012 at 15:16 UTC ( #983680=note: print w/ replies, xml ) Need Help??

in reply to Re^2: get n lines before a pattern
in thread get n lines before or after a pattern

Yes, the changes to the file in the OP certainly require an updated approach. What have you tried?

I would loop through the file saving each key and either pushing to a data structure if the name matches or resetting and continuing.

Pseudo code for the loop and structure I'd use:

my @matches; my $FOUND = 0; my %info = {}; while (<INFILE>) { chomp $_; if (($_ =~ /^id/) and ($FOUND)) { push @matches \%info; $FOUND = 0; %info = {} } if ($_ =~ /^id/) { (undef, $info{id}) = split / /, $_} if ($_ =~ /^address/) { (undef, $info{address}) = split / /, $_} if ($_ =~ /^name/) { (undef, $info{fname}) = split / /, $_} ... if ($searchPattern eq $info{fname}) { $FOUND = 1; } }

UPDATE: Added 'chomp' and updated 'split' commands as per kennethk suggestions to me.

Comment on Re^3: get n lines before a pattern
Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://983680]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (10)
As of 2016-05-05 15:25 GMT
Find Nodes?
    Voting Booth?