Get info from line above preg_match - php

Question

I've a log file that reads as
text message sent to client 1234 and mobileNo: 987654
Message: This is working
Confirmation No: ab123
text message sent to client 4321 and mobileNo: 456789
Message: This is not working
Confirmation No:
I have to get an alert if there is no confirmation number (i.e. Confirmation No: )
I've written the following code:
preg_match('/Confirmation No:\s*$/', $logLine, $match);
$matchLine = implode(" ",$match);
if ($matchLine == NULL) {
echo "There is an empty Confirmation No";
} else {
echo "Confirmation No: " . $matchLine;
}
This works fine and prints "There is an empty Confirmation No", if there is no confirmation.
But I would like to add clientID and MobileNo in the output too, i.e. There is an empty confirmation for client 4321 on MobileNo: 456789.
Can someone please advise, how can I do that?
Thanks in advance

Answer 1

preg_match("/Confirmation\sNo:\s(.*)..*client\s(\d+)\sand\smobileNo:\s(\d+)/ms", $string, $match);
if ($match[1] == "") {
echo "There is an empty Confirmation No for client " . $match[2] . " on MobileNo: " . $match[3];
} else {
echo "Confirmation No: " . $match[1];
}
https://regex101.com/r/qU7aP2/1
EDIT: I just noticed, maybe it's the other way around??
https://regex101.com/r/oY4hD9/1
$pattern = "/client\s(\d+)\sand\smobileNo:\s(\d+)..*Confirmation\sNo:\s(\w+)/ms";
I wasn't sure how the string was built.
Not that if this is the regex pattern you need then the code $match[x] needs to change places.

Answer 2

Here is how I'd do the job:
// within the loop on the log file
if (preg_match('/\b(client \d*) and \b(mobileNo: \d*)/', $logLine, $m)) {
$client = 'There is an empty confirmation for '.$m[1].' on '.$m[2];
}
if (preg_match('/Confirmation No: (\w*)$/', $logLine, $m) {
if (empty($m[1])) {
echo $client;
} else {
echo $logLine;
}
$client = '';
}