How can `eregi()` function can be replaced in below code with `preg_match()` function?

Question

How can eregi() function can be replaced here with preg_match() function in below given code?

function getOS($userAgent) {
  // Create list of operating systems with operating system name as array key 
    $oses = array (
        'iPhone' => '(iPhone)',
        'Windows 3.11' => 'Win16',
        'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)', // Use regular expressions as value to identify operating system
        'Windows 98' => '(Windows 98)|(Win98)',
        'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
        'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
        'Windows 2003' => '(Windows NT 5.2)',
        'Windows Vista' => '(Windows NT 6.0)|(Windows Vista)',
        'Windows 7' => '(Windows NT 6.1)|(Windows 7)',
        'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
        'Windows ME' => 'Windows ME',
        'Open BSD'=>'OpenBSD',
        'Sun OS'=>'SunOS',
        'Linux'=>'(Linux)|(X11)',
        'Safari' => '(Safari)',
        'Macintosh'=>'(Mac_PowerPC)|(Macintosh)',
        'QNX'=>'QNX',
        'BeOS'=>'BeOS',
        'OS/2'=>'OS/2',
        'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp/cat)|(msnbot)|(ia_archiver)'
    );

    foreach($oses as $os=>$pattern){ // Loop through $oses array
    // Use regular expressions to check operating system type
        if(eregi($pattern, $userAgent)) { // Check if a value in $oses array matches current user agent.
            return $os; // Operating system was matched so return $oses key
        }
    }
    return 'Unknown'; // Cannot find operating system so return Unknown
}

kappa · Accepted Answer · 2012-03-31T07:59:39.917

2

You have to add an "i" after the right pattern delimiter to enable the case insensitive match

so:

a|b

will be:

/a|b/i

To do it quickly write before preg_match:

$pattern='/'.$pattern.'/i';

Otherwise you have to change all your patterns and substitute like this:

(Linux)|(X11)

becomes

/(Linux)|(X11)/i

edited Mar 31 '12 at 07:59

answered Mar 31 '12 at 07:52

kappa

1,559
8
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+1 please elaborate it, where i have to do it and how? show me in code – OM The Eternity Mar 31 '12 at 07:53
:) i'm on iPhone .. so i'm slow in writing – kappa Mar 31 '12 at 08:01

score 0 · Answer 2 · edited Aug 24 '13 at 02:17

0

You can use either

if(preg_match("#".$pattern."#", $userAgent)) {

or

 if(preg_match('`'.$pattern.'`i', $userAgent)) {

edited Aug 24 '13 at 02:17

Jsdodgers

5,253
2
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36

answered Aug 24 '13 at 01:56

warfish

613
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How can `eregi()` function can be replaced in below code with `preg_match()` function?

2 Answers2