php, regex and ldifde base64_encode / Replace multiple lines

Question

I need a simple regex string from you.

For example, thats my regex example.

preg_replace('#([a-z]+)\:\:' . "([\r\n a-z0-9=]*)" . '#is', '\1:: \2', /* Example string */)

And thats the example string.

dn: CN=Gast,CN=Users,DC=question,DC=local
changetype: add
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: user
cn: Gast
description:: 
 Vm9yZGVmaW5pZXJ0ZXMgS29udG8gZsO8ciBHYXN0enVncmlmZiBhdWYgZGVuIENvbXB1dGVyIGJ6dy
 4gZGllIERvbcOkbmU=
name: Gast
sAMAccountName: Gast
unicodePwd::IgA2AEcATQBNAHQANwBoADcAIgA=
userAccountControl:512

The result is the following.

dn: CN=Gast,CN=Users,DC=question,DC=local
changetype: add
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: user
cn: Gast
description:  
 Vm9yZGVmaW5pZXJ0ZXMgS29udG8gZsO8ciBHYXN0enVncmlmZiBhdWYgZGVuIENvbXB1dGVyIGJ6dy
 4gZGllIERvbcOkbmU=
name: Gast
sAMAccountName: Gast
unicodePwd::IgA2AEcATQBNAHQANwBoADcAIgA=
userAccountControl:512

I would have this result.

dn: CN=Gast,CN=Users,DC=question,DC=local
changetype: add
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: user
cn: Gast
description:: Vm9yZGVmaW5pZXJ0ZXMgS29udG8gZsO8ciBHYXN0enVncmlmZiBhdWYgZGVuIENvbXB1dGVyIGJ6dy4gZGllIERvbcOkbmU=
name: Gast
sAMAccountName: Gast
unicodePwd::IgA2AEcATQBNAHQANwBoADcAIgA=
userAccountControl:512

Then i could do this.

$lines = explode("\r\n", /* Example string */);
foreach($lines as $line)
{
    $tmp = explode(':', $line);
    if(count($tmp) > 2)
    {
        $tmp = explode('::', $line);
        $tmp[1] = base64_decode($tmp[1]);
    }
}

Or is it possible to do this easier??

Thank you in Advance!

Jonny 5 · Accepted Answer · 2014-08-15 10:30:39Z

1

Also this would be possible:

1.) Strip spaces after :: and space-newlines-space

$str = preg_replace('/::\K\s+|\s*\n(?=[^:]*(\n|$))\s*/', "", $str);

Regex explanation at regex101. Strips white-space characters after :: | OR space-newlines-space if no colon exists in the next line (checking with a lookahead).

2.) base64 decode using a callback:

$str = preg_replace_callback('/(?<=::)\S+/',
       function ($m) { return base64_decode($m[0]); },
       $str);

\S+ Non-white-space characters after a :: using a lookbehind, see regex101

3.) Add space after ::

$str = str_replace("::", ":: ", $str);

See example at eval.in

If your PHP version has no support for anonymous functions, swap the function out:

function b64d ($m) { return base64_decode($m[0]); }
$str = preg_replace_callback('~(?<=::)\S+~', "b64d", $str);

Hope this helps!

edited Aug 15, 2014 at 10:30

answered Aug 15, 2014 at 10:22

Jonny 5

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2 Comments

PatrickB Over a year ago

Yes really good!! Thank you. I dont know why i'm not using multiple things like yours. But i dont now for what \K stands and why you use \n and not \r\n ^^

Jonny 5 Over a year ago

@PatrickB Used \K as a lookbehind here, same as (?<=::)\s+|.... Read more about \K. And to other question: I used only \n because it's preceded by \s* whitch is a shorthand for [ \t\r\n\f] (including \r) and makes it more compatible. Strip spaces with at least one \n newline if not followed by any amount of non-colons and another \n or end. Happy answer works for you :)

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