Extracting tag values from XML using perl Post: 302222131

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Top Forums Shell Programming and Scripting Extracting tag values from XML using perl Post 302222131 by Steve_altius on Wednesday 6th of August 2008 05:07:49 AM

08-06-2008

Registered User

Extracting tag values from XML using perl

Hi All,

I'm trying to extract the values for the 'src' and 'alt' tags within an xml file. In the files that I'm searching, the tags are always enclosed within an 'img' tag. Typically:

<img src="diwiz01.gif" width="576" height="254" alt="Out-of-process and In-process COM Objects"><bookmark name="f003"/></img>

I grep for 'img' and pipe to the following perl code that successfully extracts the required data:

Code:

#!/usr/bin/perl
while (<>) {
   while (m/img src=\"(.*?)\"/ig) {
      print $1,"|";
      }
   while (m/alt=\"(.*?)\"/ig) {
      print $1,"\n";
      }
      }

However, the xml source occasionally contains the 'src' and 'alt' tags in a different order within the 'img' tag. For example:

<img width="470" height="321" alt="A Remote COM Object" src="dicwiz02.gif"><bookmark name="f004"/></img>

Consequently, the above code doesn't work.

The basis of the code was originally used for a different problem and I didn't write it. I've modified it in an attempt to satisfy this problem. Unfortunately, although I know the basics of sed and awk (but hardly any perl), I'm not a programmer and I'm struggling a bit.

Any help gratefully received.

Thanks.

Steve_altius

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LEARN ABOUT SUSE

tracker-tag

tracker-tag(1)							   User Commands						    tracker-tag(1)

NAME

       tracker-tag - Add, remove and list tags.

SYNOPSIS

       tracker-tag [OPTION...] FILE [FILE...]

DESCRIPTION

       tracker-tag allows the caller add tags, remove tags and list tags by URN or to list all tags and the files associated with them.

       The FILE argument can be either a local path or a URI. It also does not have to be an absolute path.

OPTIONS

       -?, --help
	      Show summary of options.

       -l, --limit=N
	      Limit search to N results. The default is 512.

       -o, --offset=N
	      Offset the search results by N. For example, start at item number 10 in the results. The default is 0.

       -r, --or-operator
	      Use OR for search terms instead of AND (the default)

       -t, --list
	      List  all tags. Results include the number of files associated with that tag and the tag's unique identifier. You can show the files
	      associated with each tag by using --show-files.

       -s, --show-files
	      Show the files associated with each tag. This option is ONLY available WITH the --list option.

       -a, --add=TAG
	      Add a tag with the name TAG.  If no FILE arguments are specified, the tag is simply created (if it  didn't  already  exist)  and	no
	      files are associated with it. Multiple FILE arguments can be specified.

       -d, --delete=TAG
	      Delete  a tag with the name TAG.	If no FILE arguments are specified, the tag is deleted for ALL files. If FILE arguments are speci-
	      fied, only those files have the TAG deleted.

       -V, --version
	      Print version.

SEE ALSO

       tracker-store(1), tracker-sparql(1), tracker-search(1), tracker-info(1).

GNU
								     July 2009							    tracker-tag(1)

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