Re: Perldoc: String interpolation with octal escpape sequence like \1

perlop under Quote and Quote like Operators

The following escape sequences are available in constructs that interpolate, and in transliterations:
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\033 [7,8] restricted range octal char (example: ESC)
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Some contexts allow 2 or even 1 digit, but any usage without exactly three digits, the first being a zero, may give unintended results.
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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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Re^2: Perldoc: String interpolation with octal escpape sequence like \1 by Eily (Monsignor) on Oct 02, 2018 at 15:18 UTC
Also: Starting in Perl 5.14, you may use \o{} instead, which avoids all these problems. Otherwise, it is best to use this construct only for ordinals \077 and below, remembering to pad to the left with zeros to make three digits. Basically "Don't do it". The confusion with \1 and so on being the main reason IMHO.	[reply]
Re^3: Perldoc: String interpolation with octal escpape sequence like \1 by LanX (Saint) on Oct 02, 2018 at 15:31 UTC
> Basically "Don't do it". "Don't do it"* doesn't mean document it badly, especially if there is no warning. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice} *) BTW I agree!	[reply]
Re^2: Perldoc: String interpolation with octal escpape sequence like \1 by LanX (Saint) on Oct 02, 2018 at 15:29 UTC
thanks, but still hard to find! edit I always considered this perlop#Quote-and-Quote-like-Operators a convoluted monster. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]

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