Here's a simple script that will do what you're asking. Rather than editing the existing file, it redirects to a new file "text.out". If you need to, simply add a system command to rename text.out to basic.txt. Obviously, there are better/different ways of handling this, but you weren't very specific about your scenario.
-fuzzyping
#!/usr/bin/perl
use strict;
my $string_to_match = "I dont have money";
my $string_to_insert = "yes thats correct\nbut your should have\nmoney
+ with you\notherwise it is not\npossible\n";
open(INFILE, "basic.txt");
open(OUTFILE, ">>text.out");
while (<INFILE>) {
unless (/$string_to_match/) {
print OUTFILE $_;
} else {
print OUTFILE $_, $string_to_insert;
}
}
close(OUTFILE);
close(INFILE);
1;
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