Regular Expression Weirdness

alanl

Hi All,

Please can somebody help!!! I have a really strange problem with regular expressions.

I've written the following code:

function pre_process_body($arg_body)
{
while(eregi('(.)<\?php (.+)\?>(.)', $arg_body, $arr_body))
{
$php = trim('$tmp = '.$arr_body[2]);

  if(substr($php,-1,1) != ';')
  {
     $php .= ';';
  }
  eval($php);
  $arg_body = $arr_body[1].$tmp.$arr_body[3];

}
return($arg_body);
}

Which works fine on my development box (php 3.0.14) but not on the real web server (php 3.0.18).

Using phpinfo, I can see that my dev box has "Bundled regex library enabled", but the web server has "System regex library enabled".

Does anybody know if this is the problem? Or even what the two lines actually mean?

I'm really stuck on this and could really do with some help.

Thanks,
Alan

alanl

Ok...so nobody knows the difference between the bundled and system regular expression libraries?

sveinhal

When installing and configuring PHP, you have the option to choose what regex library you want to use. You could either use the one that Apache uses (the system library) or the one bundled with php. (Or at least this is how I think it works).

It should mean no difference as long. That your regex fails, could be due to incompabilities og failure in the system's library.

Again, I must emphasize that I don't know exactly how this works, but I thought that using the system library would mean nothing from a scripting perspective.

Hope this helps (probably not, but anyway...)
Svein Halvor Halvorsen

sveinhal

It should mean no difference as long.

This uncomplete sentence should, of course, not be in here. Just ignore this as I decided to rewrite my sentence as I wrote it. I just never got to erase what I had previously written.

Svein Halvor Halvorsen

alanl

Thanks for that, I had a horrible feeling this may be the case. I have no control over the config of the web server - hence it's wrong! ;-)

I'll see if I can get the hosting provider to change their set up.

Cheers,
Alan