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in reply to Basic debugging checklist

perl -Mre=debug foo.pl can help you see how perl interprets your regex, much in the way O=Deparse does for perl code

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Re^2: Basic debugging checklist
by Anonymous Monk on Oct 31, 2014 at 07:38 UTC
    If you don't quite understand what you're looking at (output of deparse, perl syntax), then ppi_dumper can help you look at the right part of the manual, an example 
    $ ppi_dumper 2
PPI::Document
  PPI::Statement::Include
    PPI::Token::Word    'use'
    PPI::Token::Whitespace      ' '
    PPI::Token::Word    'constant'
    PPI::Token::Whitespace      ' '
    PPI::Token::Word    'X'
    PPI::Token::Whitespace      ' '
    PPI::Token::Operator        '=>'
    PPI::Token::Whitespace      ' '
    PPI::Token::Number          '1'
    PPI::Token::Operator        '/'
    PPI::Token::Number          '3'
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Token::Whitespace        '\n'

    [download]

    So PPI::Token::Operator tells you "=>" is an operator

    If you read perl/"perltoc" then you'll know that operators are documented in perlop

    App::PPI::Dumper / ppi_dumper

    wxPPIxregexplain.pl

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In Section Tutorials