pattern to eregi_replace

I am trying to delete a row from a tab delimited text file. The row contains data including an email address. I want to use a pattern that looks for the whole row so I can replace it with a blank row (thereby deleting it from the file). I am using PHP3 and the eregi_replace() function. The pattern that I have tried (which doesn't work) is $pattern="^(\n+)([.]+)?($email+)([.]+)?(\n+)";
I am trying to search for everthing between the returns (the whole row) that also contains a specific email address. Basically, I am trying to delete an entry from a mailing list using the email as a reference. Can someone help me with a pattern that would do this?

PHP 3 ey? Does it have ereg_replace? I'm assuming not, so how about just searching for everything that's *not* the email address, something like this:

^[\$email]?[$email][\$email]?$

Just a rough idea, but if you could post a couple of rows then i could see how they look and forumate a better pattern...

I tested the eregi_replace and found that it actually works, but I have to find a good pattern. Here is what I have...

$email_unsubscribe=trim($email_unsubscribe);
$the_file="lists/data.txt";
$open=fopen ($the_file,"r");
$pattern="^(\n+)([.]+)?($email+)([.]+)?(\n+)";
$replace="\n";
if ($open) {
$data=file($the_file);
$data=implode("",$data);
if (eregi($pattern,$data)) {
$data=eregi_replace($pattern,$replace,$data);
fclose ($open);
$open=fopen ($the_file,"w");
if ($open) {
fwrite($open,$data);
fclose ($open);
header("location:unsubscribe_success.php?email=$email_unsu bscribe");
}
} else {
header("location:unsubscribe_failed.php?email=$email_unsub scribe");
}
}