[Epsilon]

I thought PHP used standard POSIX regular expressions. Is this wrong? I used the following code to populate a drop-down list with the intention of excluding any element in the array $sites that contained a space:

while ($array_cell = each($sites))
{
   if (!ereg("\s",$array_cell[value]))
   {
      print ("<option value=\"".strtolower($array_cell[value])."\"$selected>".$array_cell[value]."</option>\n");
   }
}

I'm used to Perl where \s matches any whitespace character. But in PHP this code literally matched a lowercase s character -- not cool.

I replaced the regular expression with:

!ereg(" ",$array_cell[value])

and it properly matched spaces, but I'm concerned about the reliability of this method. There are other ways to make a space aside from ASCII code 32 (pressing the space bar). Could this cause a problem? Is there a REGEXP symbol in PHP that will match ANY whitespace as there is in Perl?