Re:The reports of Perl’s death have been greatly exaggerated
by chefandy on Thursday October 21, 2021 @09:53AM
(#28944392)
You're right— I didn't say what I really meant there. It's not the regex syntax itself, but the syntax surrounding the use of regex's which is more efficient. Compare the number of keystrokes in his examples above (e.g. $string =~ s/search pattern/replacement string/g;) with what you'd have to do using nearly any other language. In Python for example, remember that you'd need to precompile the regex to even approach 8x slower speeds.
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Re:The reports of Perl’s death have been greatly exaggerated
by petre on Thursday October 21, 2021 @10:04AM
(#28944556)
Well, that was inspired by sed. I have to do a test in Ruby too see how fast regexos are, being spoiled by Perl usage and all. What I don't like is this:
my $a = 'Perl';
my $b = $a;
$b =~ s/pe/ea/i;
a = 'Ruby'
b = a.gsub(/ru/i, 'mo')
Re:The reports of Perl’s death have been greatly exaggerated
by chefandy on Thursday October 21, 2021 @11:22PM
(#28953395)
oh— for regex performance Perl blows Swift, Java, Python, Ruby, Go, and C++ out of the water. For simple string manipulation— substring replacement, string reversal, etc. it's never the worst but never the best. Scroll down to the bottom of this paper where they test actual regexes though and the difference is pretty stunning.
Re:The reports of Perl’s death have been greatly exaggerated
by chromatic on Thursday October 21, 2021 @03:03PM
(#28949394)
No need to copy and then replace:
my $a = 'Perl';
my $b =~ s/pe/ea/ir;
Re:The reports of Perl’s death have been greatly exaggerated
by petre on Friday October 22, 2021 @02:11AM
(#28954160)
Doesn't work. You don't assign anything to $b, so it's undef:
% perl -MData::Dumper=Dumper -e 'my $a = 'Perl'; my $b =~ s/pe/ea/ir; print Dumper $b;'
$VAR1 = undef;
my $a = 'Perl';
my $b = $a =~ s/pe/ea/ir;