Exception on php mb_ereg_match - php

Question

I am using mb_ereg_match to validate that a domain name does not containe illegal characters.
I am using this regex:
'/:\/\/|www[.][a-zA-Zα-ωΑ-ΩάέύήίόώϋϊΐΰΆΈΏΊΎΌΉΫΪÀàÂâÆæÄäÇçÉéÈèÊêËëÎîÏïÔôŒœÖöÙùÛûÜüŸÿ0-9]+[.]|^[-]+|^[.]+|[-]+$|[.]+$|[-]{2,}|[.]{2,}|[^\w-.]|-[.]|[.]-/u'
Which as you can se by your self contain all the basic latin chars, nums, France's letters and the whole Greek alphabet.
My validation code is the following:
$utf8 = (mb_detect_encoding($value) == 'UTF-8') ? TRUE : FALSE;
if ($utf8){
mb_internal_encoding('UTF-8');
mb_regex_encoding('UTF-8');
$matches = mb_ereg_match($pattern, $value);
}else{
preg_match($pattern, $value, $matches);
}
I am trying to validate this:
'geoσσσrge.cσσσσσm.gr'
Here is the error I get:
mb_ereg_match(): mbregex compile err: empty range in char class
The error does not appear all the time. Usually it apears when it stays idle for a long time and after I refresh my page returns to normal.
I don't know how to handle this error or how to approche it in order to find the source of the problem.
Any suggestions?

Answer 1

\w through . is not a range it can understand. Escape the - or move the - to the start; [^\w-.].
$pattern = '/:\/\/|www[.][a-zA-Zα-ωΑ-ΩάέύήίόώϋϊΐΰΆΈΏΊΎΌΉΫΪÀàÂâÆæÄäÇçÉéÈèÊêËëÎîÏïÔôŒœÖöÙùÛûÜüŸÿ0-9]+[.]|^[-]+|^[.]+|[-]+$|[.]+$|[-]{2,}|[.]{2,}|[^\w\-.]|-[.]|[.]-/u';
$value = 'geoσσσrge.cσσσσσm.gr';
$utf8 = (mb_detect_encoding($value) == 'UTF-8') ? TRUE : FALSE;
if ($utf8){
mb_internal_encoding('UTF-8');
mb_regex_encoding('UTF-8');
$matches = mb_ereg_match($pattern, $value);
}else{
preg_match($pattern, $value, $matches);
}
or
$pattern = '/:\/\/|www[.][a-zA-Zα-ωΑ-ΩάέύήίόώϋϊΐΰΆΈΏΊΎΌΉΫΪÀàÂâÆæÄäÇçÉéÈèÊêËëÎîÏïÔôŒœÖöÙùÛûÜüŸÿ0-9]+[.]|^[-]+|^[.]+|[-]+$|[.]+$|[-]{2,}|[.]{2,}|[^-\w.]|-[.]|[.]-/u';
$value = 'geoσσσrge.cσσσσσm.gr';
$utf8 = (mb_detect_encoding($value) == 'UTF-8') ? TRUE : FALSE;
if ($utf8){
mb_internal_encoding('UTF-8');
mb_regex_encoding('UTF-8');
$matches = mb_ereg_match($pattern, $value);
}else{
preg_match($pattern, $value, $matches);
}