PHP regex - unable to match. Variable has '\r\n'

Question

Having some trouble with what seems a simple match operation. I'm pretty sure some knowledgeable person knows what i'm missing here...

$errors = array(
    "Error: Unrecognized command found at '^' position",
);

if (in_array($result, $errors)) {
    //do something
}

When I echo out $result, it returns

"Error: Unrecognized command found at '^' position"

But it is not found in the array. When i echo out as json:

"^\r\nError: Unrecognized command found at '^' position"

I tried using preg_replace to remove ^\\r\\n, but still no match. Any ideas?

Answer 1

I believe the issue is because you were looking for the \\r and \\n special characters instead of litterals. You can use the \\ escape character to fix this:

^\\\\r\\\\n

Online Demo

Answer 2

You can use ltrim function and explicitly specify the characters you want to remove, including ^ :

$str = ltrim("^\r\nError: Unrecognized command found at '^' position", "^\r\n");
var_dump($str);
// string(49) "Error: Unrecognized command found at '^' position"

Answer 3

Try using str_replace

Please find the below snippet which works absolutely fine:

$errors = array(
"Error: Unrecognized command found at '^' position",
);
$result = "\r\nError: Unrecognized command found at '^' position";
$result = str_replace("\r\n", '', $result);
if (in_array($result, $errors)) {
  echo 'Hello World!';
}

Output:

Hello World!