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Top Forums UNIX for Beginners Questions & Answers Grep -P does not capture the desired output Post 303037319 by Don Cragun on Monday 29th of July 2019 05:59:35 PM
Old 07-29-2019
Quote:
Originally Posted by Corona688
AFAIK the multiple characters as RS ought to work with most awk, what won't work with some is RS as a regex.
Hi Corona688,
That might be true in some implementations. (And the BSD based awk on MacOS Version 10.14.5 does work that way.) However, the description of the awk RS variable in the standards is:
Quote:
The first character of the string value of RS shall be the input record separator; a
<newline> by default. If RS contains more than one character, the results are
unspecified.
If RS is null, then records are separated by sequences consisting of a
<newline> plus one or more blank lines, leading or trailing blank lines shall not
result in empty records at the beginning or end of the input, and a <newline> shall
always be a field separator, no matter what the value of FS is.
This User Gave Thanks to Don Cragun For This Post:
 

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Mail::Mbox::MessageParser::Grep(3)			User Contributed Perl Documentation			Mail::Mbox::MessageParser::Grep(3)

NAME
Mail::Mbox::MessageParser::Grep - A GNU grep-based mbox folder reader SYNOPSIS
#!/usr/bin/perl use Mail::Mbox::MessageParser; my $filename = 'mail/saved-mail'; my $filehandle = new FileHandle($filename); my $folder_reader = new Mail::Mbox::MessageParser( { 'file_name' => $filename, 'file_handle' => $filehandle, 'enable_grep' => 1, } ); die $folder_reader unless ref $folder_reader; # Any newlines or such before the start of the first email my $prologue = $folder_reader->prologue; print $prologue; # This is the main loop. It's executed once for each email while(!$folder_reader->end_of_file()); { my $email = $folder_reader->read_next_email(); print $email; } DESCRIPTION
This module implements a GNU grep-based mbox folder reader. It can only be used when GNU grep is installed on the system. Users must not instantiate this class directly--use Mail::Mbox::MessageParser instead. The base MessageParser module will automatically manage the use of grep and non-grep implementations. METHODS AND FUNCTIONS The following methods and functions are specific to the Mail::Mbox::MessageParser::Grep package. For additional inherited ones, see the Mail::Mbox::MessageParser documentation. $ref = new( { 'file_name' => <mailbox file name>, 'file_handle' => <mailbox file handle> }); <file_name> - The full filename of the mailbox <file_handle> - An opened file handle for the mailbox The constructor for the class takes two parameters. The file_name parameter is the filename of the mailbox. The file_handle argument is the opened file handle to the mailbox. Returns a reference to a Mail::Mbox::MessageParser object, or a string describing the error. BUGS
No known bugs. Contact david@coppit.org for bug reports and suggestions. AUTHOR
David Coppit <david@coppit.org>. LICENSE
This software is distributed under the terms of the GPL. See the file "LICENSE" for more information. HISTORY
This code was originally part of the grepmail distribution. See http://grepmail.sf.net/ for previous versions of grepmail which included early versions of this code. SEE ALSO
Mail::Mbox::MessageParser perl v5.12.1 2009-08-09 Mail::Mbox::MessageParser::Grep(3)
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