FAQ 6.3 How can I pull out lines between two patterns that are themselves on different lines?

Discussion in 'Perl Misc' started by PerlFAQ Server, Jan 14, 2011.

  1. This is an excerpt from the latest version perlfaq6.pod, which
    comes with the standard Perl distribution. These postings aim to
    reduce the number of repeated questions as well as allow the community
    to review and update the answers. The latest version of the complete
    perlfaq is at http://faq.perl.org .

    --------------------------------------------------------------------

    6.3: How can I pull out lines between two patterns that are themselves on different lines?

    You can use Perl's somewhat exotic ".." operator (documented in perlop):

    perl -ne 'print if /START/ .. /END/' file1 file2 ...

    If you wanted text and not lines, you would use

    perl -0777 -ne 'print "$1\n" while /START(.*?)END/gs' file1 file2 ...

    But if you want nested occurrences of "START" through "END", you'll run
    up against the problem described in the question in this section on
    matching balanced text.

    Here's another example of using "..":

    while (<>) {
    $in_header = 1 .. /^$/;
    $in_body = /^$/ .. eof;
    # now choose between them
    } continue {
    $. = 0 if eof; # fix $.
    }



    --------------------------------------------------------------------

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    so please include as much information as possible and relevant in any
    corrections. The perlfaq-workers also don't have access to every
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    corrections to examples that do not work on particular platforms.
    Working code is greatly appreciated.

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    PerlFAQ Server, Jan 14, 2011
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