Thanks for the reply. The reason I used regular expressions was that the actual XML is contained within a log file that contains other information besides xml. Will the XML:LibXML handle any type of file or does it strictly need a xml file?

I tried the following using this script and am getting a parser error Start tag expected, '<' not found. Below is the code: 

#!/usr/bin/perl
use XML::LibXML;
my $requestId = $ARGV[0];
my $fileName = "sample.xml";

print "$requestId\n";
print "$fileName\n";

my $doc = XML::LibXML->load_xml(string=>$fileName);
my @nodes = $doc->findnodes("/*/EventInfo[\@RequestId='$requestId']");
for my $node (@nodes) {
  print "### ", $node->getParentNode->toString, " ###\n\n";
}

[download]

The sample xml file is as follows:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <DeliveryTimeChanged CurrentStatus="OnHold" xmlns:ns2="http://com/post/orderupdatesasync/jaxbxml"> <EventInfo EventId="666313444" CreationDatetime="2017/02/09 07:59:17 369 GMT" RequestId="321150454"> <TopicCounts TopicName="DELIVERY.TIME.CHANGED" TopicCount="1"/> </EventInfo> <DeliveryChangeOperationType OperationTypeCode="DELAY" OperationSubtypeCode="HOLD" DeliveryChangeReason="Weather" DeliveryDate="20170210"/> </DeliveryTimeChanged>

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <DeliveryRouteChanged CurrentStatus="OnHold" xmlns:ns2="http://com/post/orderupdatesasync/jaxbxml"> <EventInfo EventId="666313445" CreationDatetime="2017/02/09 07:59:23 639 GMT" RequestId="321150454"> <TopicCounts TopicName="DELIVERY.ROUTE.CHANGED" TopicCount="1"/> </EventInfo> <DeliveryRouteType OperationTypeCode="AIR" OperationSubtypeCode="HOLD" DeliveryDate="20170210"/> </DeliveryRouteChanged>

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <DeliveryCanceled CurrentStatus="Canceled" xmlns:ns2="http://com/post/orderupdatesasync/jaxbxml"> <EventInfo EventId="666313446" CreationDatetime="2017/02/09 07:59:44 963 GMT" RequestId="421150444"> <TopicCounts TopicName="DELIVERY.STATUS.CANCELED" TopicCount="1"/> </EventInfo> <DeliveryStatusType DeliveryStatusCode="CX" OperationSubtypeCode="CANCELED" DeliveryDate="20170210"/> </DeliveryCanceled>

In reply to Re^2: Retrieving XML From a File Based On Child Node Attribute by the_r
in thread Retrieving XML From a File Based On Child Node Attribute by the_r

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