I write scripts which compare two text files and then do interesting things if they are different. 
use Text::Diff qw(diff);
[...]
$diff = diff "$config_dir/$config_old", "$config_dir/$config_new", 
        { STYLE => "OldStyle"};
@diff = split '\n', $diff;
[...]

[download]
Typically, I want to ignore certain changes ... in the example below, I am uninterested in lines which contain the string 'set password ENC'. I end up writing code like: 
LINE:
for my $line (@diff) {
    next LINE if $line =~ /set password ENC/;
    [...]
}

[download]
Now, I'm discovering that I am uninterested in changes to private keys ... a typical line in a file might look like this: 
        set private-key "-----BEGIN ENCRYPTED PRIVATE KEY-----
MIIFDjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQInXCep+2zzpgCAggA
MBQGCCqGSIb3DHMHBAiSZZZ3CUL1cQSCBNhxHiU0wI3XOMU05aVZybU6OOJOJBa/
M+b28ad6P8VZiN+eToUfs3pTg+VqzAc273fdnZPZFMClXpJk8kQZv0ruEoA99RqE
pgsnYGVxzZNmDy5HT3yBDGjRCssDnQ8QUBqabFCpW6d7fzilw9PnoHjFRmLxKnNE
[...]

[download]
I'm struggling to figure out how to ignore such lines. My brain wants to construct a regex which identifies "random strings", so that I could write a line like: 
    next LINE if $line =~ /{looks like random stuff to me}/;

[download]
(1) Suggestions on how to construct such a regex?
(2) Suggestions on how to tackle the problem differently?

--sk

In reply to regex for identifying encrypted text by skendric

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