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Full Discussion: Converting perl regex to sed regex
Top Forums Shell Programming and Scripting Converting perl regex to sed regex Post 302467591 by suntzu on Saturday 30th of October 2010 05:15:54 AM
Old 10-30-2010
Converting perl regex to sed regex
I am having trouble parsing rpm filenames in a shell script.. I found a snippet of perl code that will perform the task but I really don't have time to rewrite the entire script in perl. I cannot for the life of me convert this code into something sed-friendly:

Code:
if ($rpm =~ /([a-zA-Z0-9_\-\+]*)-([a-zA-Z0-9_\.]*)-([a-zA-Z0-9_\.]*)\.(.*)/) {
        my $name = $1;
        my $version = $2;
        my $release = $3;
        my $arch = $4;

        ...your code here...

}

(note this is originally from linux engineer's blog and the author states you could simply add "\" before the parens but this still won't work for me.

What would you do?
Any advice is would greatly appreciated. Thank you in advance.
sun
Last edited by Scott; 10-30-2010 at 06:50 AM.. Reason: Please use code tags
 

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LEARN ABOUT CENTOS

makedeltarpm

MAKEDELTARPM(8) 					      System Manager's Manual						   MAKEDELTARPM(8)

NAME

       makedeltarpm - create a deltarpm from two rpms

SYNOPSIS

       makedeltarpm [-v] [-V version] [-z compression] [-m mbytes] [-s seqfile] [-r] [-u] oldrpm newrpm deltarpm
       makedeltarpm [-v] [-V version] [-z compression] [-s seqfile] [-u] -p oldrpmprint oldpatchrpm oldrpm newrpm deltarpm

DESCRIPTION

       makedeltarpm  creates  a  deltarpm from two rpms. The deltarpm can later be used to recreate the new rpm from either filesystem data or the
       old rpm. Use the -v option to make makedeltarpm more verbose about its work (use it twice to make it even more verbose).

       If you want to create a smaller and faster to combine "rpm-only" deltarpm which does not work with filesystem data, specify the -r option.

       makedeltarpm normally produces a V3 format deltarpm, use the -V option to specify a different version if desired. The -z option can be used
       to specify a different compression method, the default is to use the same compression method as used in the new rpm.

       The -s option makes makedeltarpm write out the sequence id to the specified file seqfile.

       If  you	also  use  patch rpms you should use the -p option to specify the rpm-print of oldrpm and the created patch rpm. This option tells
       makedeltarpm to exclude the files that were not included in the patch rpm but are not byteswise identical to the ones in oldrpm.

       makedeltarpm can also create an "identity" deltarpm by adding the -u switch. In this case only one rpm has to  be  specified.  An  identity
       deltarpm can be useful to just replace the signature header of a rpm or to reconstruct a rpm from the filesystem.

MEMORY CONSIDERATIONS

       makedeltarpm  normally  needs  about  three to four times the size of the rpm's uncompressed payload. You can use the -m option to enable a
       sliding block algorithm that needs mbytes megabytes of memory. This trades memory usage with the size of the created deltarpm. Furthermore,
       the uncompressed deltarpm payload is currently also stored in memory when this option is used, but it tends to be small in most cases.

SEE ALSO

       applydeltarpm(8) combinedeltarpm(8)

AUTHOR

       Michael Schroeder <mls@suse.de>

								     Jul 2010							   MAKEDELTARPM(8)
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