New PHP 5.3 solution to replace ereg and eregi functions

Question

New PHP 5.3 solution to replace ereg and eregi functions

Forgive my ignorance but regex code is beyond my comprehension.

I came across this function in a php module that was not authored by me:

function isURL($url = NULL) {
    if($url == NULL) return false;

    $protocol = '(http://|https://)';
    $allowed = '([a-z0-9]([-a-z0-9]*[a-z0-9]+)?)';

    $regex = "^". $protocol . // must include the protocol
                     '(' . $allowed . '{1,63}\.)+'. // 1 or several sub domains with a max of 63 chars
                     '[a-z]' . '{2,6}'; // followed by a TLD
    if(preg_match("/$regex/", $url)) return true;
    else return false;
}

Could someone please assist me in updating this code to replace the eregi function?

php eregi posix-ere

Answer 1

Answer №1

Great question - this information is crucial for those transitioning to PHP 5.3, as the ereg and eregi functions have been deprecated. To make the switch,

eregi('pattern', $string, $matches)

should be replaced with

preg_match('/pattern/i', $string, $matches)

(the additional i in the first argument indicates case-insensitivity and mirrors the behavior of eregi - simply ignore it when replacing an ereg call).

It's important to note the differences between old and new patterns! Refer to this page for a list of primary distinctions. For more complex regular expressions, delve deeper into disparities between POSIX regex (used by the previous ereg/eregi/split functions etc.) and PCRE.

In your specific scenario, confidently substitute the eregi call with:

if (preg_match("%{$regex}%i", $url))
    return true;

(notice: the % serves as a delimiter; although the slash / is typically used. Ensure that the delimiter isn't within the regex or escape it. Since slashes are present in $regex in your example, opting for a different character as the delimiter is more practical.)

Answer 2

Great question - this information is crucial for those transitioning to PHP 5.3, as the ereg and eregi functions have been deprecated. To make the switch,

eregi('pattern', $string, $matches)

should be replaced with

preg_match('/pattern/i', $string, $matches)

(the additional i in the first argument indicates case-insensitivity and mirrors the behavior of eregi - simply ignore it when replacing an ereg call).

It's important to note the differences between old and new patterns! Refer to this page for a list of primary distinctions. For more complex regular expressions, delve deeper into disparities between POSIX regex (used by the previous ereg/eregi/split functions etc.) and PCRE.

In your specific scenario, confidently substitute the eregi call with:

if (preg_match("%{$regex}%i", $url))
    return true;

(notice: the % serves as a delimiter; although the slash / is typically used. Ensure that the delimiter isn't within the regex or escape it. Since slashes are present in $regex in your example, opting for a different character as the delimiter is more practical.)

Answer 3

Answer №2

Ensure your code remains functional by using Palliative PHP 5.3 until all deprecated functions are replaced

if(!function_exists('ereg'))            { function ereg($pattern, $subject, &$matches = []) { return preg_match('/'.$pattern.'/', $subject, $matches); } }
if(!function_exists('eregi'))           { function eregi($pattern, $subject, &$matches = []) { return preg_match('/'.$pattern.'/i', $subject, $matches); } }
if(!function_exists('ereg_replace'))    { function ereg_replace($pattern, $replacement, $string) { return preg_replace('/'.$pattern.'/', $replacement, $string); } }
if(!function_exists('eregi_replace'))   { function eregi_replace($pattern, $replacement, $string) { return preg_replace('/'.$pattern.'/i', $replacement, $string); } }
if(!function_exists('split'))           { function split($pattern, $subject, $limit = -1) { return preg_split('/'.$pattern.'/', $subject, $limit); } }
if(!function_exists('spliti'))          { function spliti($pattern, $subject, $limit = -1) { return preg_split('/'.$pattern.'/i', $subject, $limit); } }

Answer 4

Ensure your code remains functional by using Palliative PHP 5.3 until all deprecated functions are replaced

if(!function_exists('ereg'))            { function ereg($pattern, $subject, &$matches = []) { return preg_match('/'.$pattern.'/', $subject, $matches); } }
if(!function_exists('eregi'))           { function eregi($pattern, $subject, &$matches = []) { return preg_match('/'.$pattern.'/i', $subject, $matches); } }
if(!function_exists('ereg_replace'))    { function ereg_replace($pattern, $replacement, $string) { return preg_replace('/'.$pattern.'/', $replacement, $string); } }
if(!function_exists('eregi_replace'))   { function eregi_replace($pattern, $replacement, $string) { return preg_replace('/'.$pattern.'/i', $replacement, $string); } }
if(!function_exists('split'))           { function split($pattern, $subject, $limit = -1) { return preg_split('/'.$pattern.'/', $subject, $limit); } }
if(!function_exists('spliti'))          { function spliti($pattern, $subject, $limit = -1) { return preg_split('/'.$pattern.'/i', $subject, $limit); } }

Answer 5

Answer №3

Are you looking for a more efficient alternative to preg_match and eregi?

if(!filter_var($URI, FILTER_VALIDATE_URL))
{ 
return false;
} else {
return true;
}

Or maybe for validating email addresses:

if(!filter_var($EMAIL, FILTER_VALIDATE_EMAIL))
{ 
return false;
} else {
return true;
}

Answer 6

Are you looking for a more efficient alternative to preg_match and eregi?

if(!filter_var($URI, FILTER_VALIDATE_URL))
{ 
return false;
} else {
return true;
}

Or maybe for validating email addresses:

if(!filter_var($EMAIL, FILTER_VALIDATE_EMAIL))
{ 
return false;
} else {
return true;
}

Answer 7

Answer №4

The use of <code>eregi in PHP is now deprecated, and you should use preg_match instead.

function validateURL($url)
{
    return preg_match('%^((https?://)|(www\.))([a-z0-9-].?)+(:[0-9]+)?(/.*)?$%i', $url);
}


if(validateURL("http://google.com"))
{
    echo "Good URL" ;
}
else
{
    echo "Bad Url" ;
}

For more information, please refer to http://php.net/manual/en/function.preg-match.php Thank you!

:)

Answer 8

The use of <code>eregi in PHP is now deprecated, and you should use preg_match instead.

function validateURL($url)
{
    return preg_match('%^((https?://)|(www\.))([a-z0-9-].?)+(:[0-9]+)?(/.*)?$%i', $url);
}


if(validateURL("http://google.com"))
{
    echo "Good URL" ;
}
else
{
    echo "Bad Url" ;
}

For more information, please refer to http://php.net/manual/en/function.preg-match.php Thank you!

:)

New PHP 5.3 solution to replace ereg and eregi functions

Answer №1

Answer №2

Answer №3

Answer №4

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