Checking if many files are there

How can I make it stop?

[adni18]

if this is my directory:

r1.txt
r2.txt
r3.txt
r4.txt
r5.txt
(of course, test.cgi)

is it possible to open up all files that go r#.txt, where # is the next number in line? I was thinking something like this, but it doesn't quite work:

$i=0;
return;
while (return;i++)
{
if(-e "/r$i.txt")
{
return;
print "r$i.txt is there!";
}
else
{
}
}

[jatar_k]

not sure if that path is right

if the files are in the same dir as the script you should only need

if(-e "r$i.txt")