parsing and regular expressions

fordiman

Meanwhile, a quick bit of help.

I\'m trying to parse out some custom tagging for custom styles in a \'zine engine.

What I need to do is replace:

&&ifGuest&&
Guest stuff
&&else&&
Member Stuff
&&/ifGuest&&

with \"Guest Stuff\" if you\'re not logged in and \"Member Stuff\" if you are.

Now, I\'ve got it partially working, IE: if you\'ve got only one &&ifGuest&& .. &&else&& .. &&/ifGuest&& in it\'ll work fine, but if you\'ve got more than one, it parses from the first one to the last one.

This is unacceptable.

The regexp I\'m using now is:
\"&&ifGuest&&.*&&/ifGuest&&\"
with some additional code underneath to handle &&else&&.

Now, I read that . is greedy, but the \'ungreedier\', .? returns an BAD_RPT error.

If anyone can help with this, it\'d be much appreciated.

fordiman

I'm still stumped. I got the POSIX RE manual and it informed me of the possibility of doing this:

&&ifGuest&&(^{[[.&&/ifGuest&&.]]*)&&/ifGuest&&}

but it still don't work.

Anon

$str = "&&ifGuest&&
Guest stuff
&&else&&
Member Stuff
&&/ifGuest&& ";

echo preg_replace("/&&ifGuest&&.*?&&\/ifGuest&&/s", "Guest stuff", $str);

fordiman

Ah, but I'd REALLY like it to capture what's between the escapes, evaluate them (with the else) and kick 'em back out. This is what I've got so far, and everything works but the replace. Can someone tell me what I'm doing wrong?

$matches = preg_match_all("|&&ifGuest&&(.?)&&/ifGuest&&|si", $finalOut, $regs, PREG_PATTERN_ORDER);
if ($matches != 0) {

for ($i=0; $i<$matches; $i++) {
if (ereg("(.)&&else&&(.*)", $regs[1][$i], $yupnope)) {
$yup = $yupnope[1];
$nope = $yupnope[2];
} else {
$yup = $regs[1][$i];
$nope = "";
}
if ($cLogin == "False") {
$finalOut = preg_replace("|" . $regs[0][$i] . "|si", $yup, $finalOut, 1);
} else {
$finalOut = preg_replace("|". $regs[0][$i] ."|si", $nope, $finalOut, 1);
}
}
}

fordiman

SOLVED IT!!!

I seem to have this problem with making things more complex than they need be.

Final solution took only two preg_replace s, depending on the user being logged in:
<tt>
if ($cLogin == "False") {
$finalOut = preg_replace("|&&ifGuest&&(.?)&&else&&(.?)&&/ifGuest&&|si", "\1", $finalOut);
$finalOut = preg_replace("|&&ifGuest&&(.?)&&/ifGuest&&|si", "\1", $finalOut);
} else {
$finalOut = preg_replace("|&&ifGuest&&(.?)&&else&&(.?)&&/ifGuest&&|si", "\2", $finalOut);
$finalOut = preg_replace("|&&ifGuest&&(.?)&&/ifGuest&&|si", "", $finalOut);
}
</tt>

Yay!!!