How to manipulate the string coming from a . reg file exported from regedit?

Question

How to abstract the values of these individual parameters and store in a variable, or use to compare with another variable ?

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\leroLero]
"parametro1"=valor
"parametro2"=valor
"parametro3"=valor

Answer 1

I believe the format is quite similar to that of the .ini (of course it has variations, but this is another situation, for the code above I believe it is similar), if it really is similar you can use the parse_ini_string, of course before it is necessary to make use preg_replace to remove some things, on specific case I just needed to remove the key quotes, example:

<?php
$regfile = file_get_contents('arquivo.reg');

$regfile = preg_replace('#(\r|\n)"|"(=)#', '$1$2', $regfile);

$parsed = parse_ini_string($regfile, false, INI_SCANNER_RAW);

var_dump($parsed);

An online example: https://ideone.com/ZyHnS0

<?php

$reg = 'Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\leroLero]
"parametro1"=valor
"parametro2"=valor
"parametro3"=valor';

$reg = preg_replace('#(\r|\n)"|"(=)#', '$1$2', $reg);

$parsed = parse_ini_string($reg, true, INI_SCANNER_RAW);

var_dump($parsed);

Will return something like:

Array
(
    [parametro1] => valor
    [parametro2] => valor
    [parametro3] => valor
)

So just compare it like this:

if ($parsed['parametro1'] == 'valor') {
   echo 'algo aqui';
}

---

Note: in case I did not process the sessions, this as false:

 $parsed = parse_ini_string($reg, true, INI_SCANNER_RAW);

but can process using true if there are more "sessions":

$parsed = parse_ini_string($reg, true, INI_SCANNER_RAW);

Then the result will be: https://ideone.com/wqyzXu

Array
(
    [HKEY_LOCAL_MACHINE\SYSTEM\leroLero] => Array
        (
            [parametro1] => valor
            [parametro2] => valor
            [parametro3] => valor
        )

)

Answer 2

The idea is to simplify by going straight to the point, making an explode() grosserio to transform each line into an array item.

Then read the relevant index.

Since the first two are mere noises, skip straight to index 3 where the first parameter is:

$data = 'Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\leroLero]
"parametro1"=valor
"parametro2"=valor
"parametro3"=valor';

$arr = explode('
', $data);

// Vai direto no índice 3, mas antes faz uma limpeza, removendo as aspas duplas.
// A função parse_str() auxilia na conversão do formato de query para variáveis
$val = parse_str(str_replace('"', '', $arr[3]), $param);

// Agora pode acessar de forma amigável o parâmetro que necessita.
echo $param['parametro1'];

If you need to read the parametro2, position is 4 (line number) and at the time of reading just call echo $param['parametro2'];.

Of course this is a didactic example. It does no validation if the index exists, etc. It is good to create consistency in the script to avoid problems.