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Re^2: syntax of Data::Dump

by WoodyWeaver (Monk)
on Nov 05, 2014 at 21:14 UTC ( #1106254=note: print w/replies, xml ) Need Help??


in reply to Re: syntax of Data::Dump
in thread syntax of Data::Dump

Thank you, but I'm still missing a clue. The reason I remain confused is perlop:
The following escape sequences are available in constructs that interpolate, and in transliterations:

    Sequence Note Description
    \t tab (HT, TAB)
    \n newline (NL)
    \r return (CR)
    \f form feed (FF)
    \b backspace (BS)
    \a alarm (bell) (BEL)
    \e escape (ESC)
    \x{263A} 1,8 hex char (example: SMILEY)
    \x1b 2,8 restricted range hex char (example: ESC)
    \N{name} 3 named Unicode character or character sequence
    \N{U+263D} 4,8 Unicode character (example: FIRST QUARTER MOON)
    \c[ 5 control char (example: chr(27))
    \o{23072} 6,8 octal char (example: SMILEY)
    \033 7,8 restricted range octal char (example: ESC)
Should this not be "\n\003\036\025"?

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Re^3: syntax of Data::Dump
by Loops (Curate) on Nov 05, 2014 at 21:22 UTC

    Well footnote 7 does say:

    Some contexts allow 2 or even 1 digit, but any usage without exactly three digits, the first being a zero, may give unintended results. (For example, in a regular expression it may be confused with a backreference; see "Octal escapes" in perlrebackslash.)

    So it would be much more clear with the 3 digit representation. But in this particular context, it works out:

    use feature 'say'; use Data::Dump qw(dump); say dump( pack("c*", 10, 3, 30, 21 ) ); # outputs "\n\3\36\25" say dump( unpack("c*", "\n\3\36\25") ); # outputs (10, 3, 30, 21) say dump( unpack("c*", "\n\003\036\025") ); # outputs (10, 3, 30, 21)
      Ah, that was the necessary clue. Sometimes the perl interpreter is too clever for me. Many thanks.

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