如何匹配上下两行，然后使用Perl在其中插入单词？

Question

How to match special characters and multiple lines at the same time? Then insert text in between those matched lines. I would like to match lines - Sample ("xx"),direction:north and market_fall ("when_promotion_8X10_b05afn10ld0b0") { as shown below. Then print text after line color code:0.000;. My coding seems wrong in somewhere. Could anyone give guidance? Thank you..

Sample ("apple") {
direction : north ;
      I dont want this line+: ;
      I dont want this line^ ;
      No this line : line ;
      color code: 0.000;
      I dont want this line: (c*b)+(c*a)+(b*a))" ;
      max_price : 3.6;
      min_price : 1.2;
      I dont want this line_time() {
        I dont want this line_t_sense : positive_1 ;
        No_this line either  : "c" ;
        market_fall ("when_promotion_8X10_b05afn10ld0b0") {  

My coding:

if(my $line =~ m/Sample(" ")/ & /direction : north/ & /market_fall ("when_promotion_8X10_b05afn10ld0b0") {/ ){    #match specific line

        print "aa\n";                 #print words at previous line
}
}

Answer 1

Try following perl one-liner from shell

perl -0777 -pe 's/(Sample\s*\("[^"]+"\)\s*\{.*direction\s*:\s*\w+\s*;.*color\s*code:\s*0.000;)(.*market_fall\s*\("[^"]+"\))/$1\nLineYouWantToInsert$2/gs' file

EDIT

If you must use it within a perl script try following piece of code.

#!/usr/bin/perl
use strict;
use warnings;

open my $fh, '<', 'file' or die $!;
my $line = do { local $/; <$fh> };
$line =~ s/(Sample\s*\("[^"]+"\)\s*\{.*direction\s*:\s*\w+\s*;.*color\s*code:\s*0.000;)(.*market_fall\s*\("[^"]+"\))/$1\nLineYouWantToInsert$2/gs;
print $line;
close $fh

Answer 2

I like abiessu's suggestion. Here is some sample code:

#!/usr/bin/perl

my $l1;
my $l2;

    while( my $line = <> ){
      $l1 = $l2;
      $l2 = $line;

        if( $l1 =~ /start1/ && $l2 =~ /start2/ ){
            print $l1;
            print "Inserted Text\n";
            print $l2;
      }
      else {
            print $l2;
      }
    }

given the input:

a
b
c
start1
start2
d
e

You will get:

a
b
c
start1
start1
Inserted Text
start2
d
e