Re: Grep Pattern

#!/usr/bin/perl -l

# https://perlmonks.org/?node_id=1227147

use strict;
use warnings;

my $pattern = '011';

my @result = grep $pattern =~ /./g && $&, 0..12;

local $, = ',';
print @result;

[download]

Replies are listed 'Best First'.
Re^2: Grep Pattern by choroba (Cardinal) on Dec 12, 2018 at 15:26 UTC
What if the last element in the pattern is T, not F? ($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, [download]	[reply] [d/l]
Re^3: Grep Pattern by tybalt89 (Monsignor) on Dec 12, 2018 at 15:41 UTC
Just invert the pattern and the test :) `#!/usr/bin/perl -l # https://perlmonks.org/?node_id=1227147 use strict; use warnings; my $pattern = '011'; my @result = grep !($pattern =~ /./g && $&), 0..12; local $, = ','; print @result;` [download] Outputs: `0,3,4,7,8,11,12` [download]	[reply] [d/l] [select]
Re^3: Grep Pattern by rsFalse (Chaplain) on Dec 15, 2018 at 20:43 UTC
Here I reset 'pos' when match approaches the end of the pattern, allowing second regex always match: `#!/usr/bin/perl # https://perlmonks.org/?node_id=1227147 use warnings; use strict; my $pattern = 'FTTF'; my @result = grep { $pattern =~ /(?!$)/g; $pattern =~ /./g; $& eq 'T' } 0 .. 12; print "@result\n";` [download]	[reply] [d/l]
Re^2: Grep Pattern by rsFalse (Chaplain) on Dec 14, 2018 at 21:36 UTC
Similar idea: `#!/usr/bin/perl # https://perlmonks.org/?node_id=1227147 use warnings; use strict; my $pattern = 'FTTF'; my $repeated_pattern = $pattern x ( 1 + ( map $_, 0 .. 12 ) / length $ +pattern ); my @result = grep { $repeated_pattern =~ /./g; $& eq 'T' } 0 .. 12; print $repeated_pattern, "\n"; print "@result\n";` [download]	[reply] [d/l]


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