Re^5: Parser Performance Question (updated)

> q< \\" > will be parsed as an escaped quote

I don't understand, it IS an escaped quote and it works for me:

  DB<175> $re = qr/ " (?: \\\\ | \\" | [^"] )* " /x;

  DB<176> p $a= q<x  "..\\".."  x>
x  "..\".."  x

  DB<177> $a =~ /$re/; print $&
"..\".."
[download]

update

maybe you should show us how you'd escape a double-quote.

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Je suis Charlie!}

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Re^6: Parser Performance Question (updated) by Eily (Monsignor) on Oct 06, 2017 at 08:02 UTC
Meh, this will teach me about posting when I can't test. I meant q< \\\\" >; but thought the \ wouldn't escape the next one. The case where the \ just before the " is litteral because escaped, so it can't escape the ". `use v5.20; use Data::Dump qw( pp ); my $str = <<STR; " .. \\\\" .. " STR print $str; my %re = (LanX => qr/ " (?: \\\\ \| \\" \| [^"] )* " /x, Eily => qr/ " (?: [^\\] \| \\. )* " /x); $str =~ /$re{$_}/ and say "$_ found $&" for keys %re;` [download] `" .. \\" .. " Eily found " .. \\" .. " LanX found " .. \\"` [download]	[reply] [d/l] [select]
Re^7: Parser Performance Question (updated) by LanX (Saint) on Oct 06, 2017 at 08:37 UTC
> `" .. \\" .. " Eily found " .. \\" .. " LanX found " .. \\"` [download] Well, you proved that my version is correct and yours doesn't work. :p Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l]
Re^8: Parser Performance Question (updated) by Eily (Monsignor) on Oct 06, 2017 at 08:45 UTC
Hu, how did I ever reach sainthood in our book? `Eily => qr/ " (?: [^"\\] \| \\. )* " /x);` <= added the missing " in the character class `use Data::Dump qw( pp ); my $str = <<STR; " .. \\" .. STR print $str; my %re = (LanX => qr/ " (?: \\\\ \| \\" \| [^"] )* " /x, Eily => qr/ " (?: [^"\\] \| \\. )* " /x); $str =~ /$re{$_}/ and say "$_ found $&" or say "$_ found nothing" for +keys %re;` [download] `" .. \" .. Eily found nothing LanX found " .. \"` [download]	[reply] [d/l] [select]
Re^9: Parser Performance Question (Atomic grouping) by LanX (Saint) on Oct 06, 2017 at 11:28 UTC
Re^10: Parser Performance Question (Atomic grouping) by Eily (Monsignor) on Oct 06, 2017 at 12:37 UTC
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Re^9: Parser Performance Question by LanX (Saint) on Oct 06, 2017 at 10:48 UTC