How do I parse a command line string to get each argument using regex?

Question

I'm working in PHP and trying to parse the information that I get from a configuration file on disk. The line looks like this:

option ssh '-p 443 -i /root/.ssh/id_rsa -N -T -R 0.0.0.0:2222:localhost:22 [email protected]

I've tried with regex or with using awk|cut under php's exec but I'm not having any success.

My ideal return value looks something like this:

    return $this->response = array(
      "host" => "example.com",
      "port" => "443",
      "user" => "root",
      "lport" => "22",
      "rport" => "2222"
    );

How do I get the arguments I need from the string with RegEx?

That isn't a trivial string to parse, and the solution depends on whether you want to check it for validity, or simply parse it for the fields you want. You should look at preg_split — Borodin
– Borodin, Commented Jan 24, 2016 at 23:14
I think you should look at getopt as it looks like you're parsing command line input — Borodin
– Borodin, Commented Jan 24, 2016 at 23:17

Professor Abronsius · Accepted Answer · 2016-01-24 23:37:27Z

2

it's not pretty and undoubtedly could be improved markedly but it more or less does what was requested, other than the 2222 ???

$str="option ssh      '-p 443 -i /root/.ssh/id_rsa -N -T -R 0.0.0.0:2222:localhost:22 [email protected]";

$pttn='#(-p (\d{1,3}) .*:(\d+):localhost:(\d+) ((\w+)@(.*)))#';
preg_match( $pttn, $str, $matches );
$response=array( 'user'=>$matches[6], 'port'=>$matches[2], 'host'=>$matches[7], 'lport'=>$matches[4], 'rport'=>$matches[3] );


print_r( $response );

outputs:
--------
Array
(
    [user] => root
    [port] => 443
    [host] => example.com
    [lport] => 22
    [rport] => 2222
)

Like I said, not pretty but...

edited Jan 24, 2016 at 23:37

answered Jan 24, 2016 at 23:18

Professor Abronsius

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