Hi All,
jmerelo on the chat line asked me to place this on Stack Overflow.
I will once I figure it out. In the mean time, here are my
notes on string subsitutions:
-T
Perl6: string subsitutions:
Reference: https://docstore.mik.ua/orelly/perl/cookbook/ch06_16.htm
Note s:g:i
s for subsitute
g for global
i for case insensititive
$ match at the end of the string
$ perl6 -e 'my $x="abc/afg/ahi"; $x ~~ s:g/a/r/; say $x'
rbc/rfg/rhi
$ perl6 -e 'my $x="abc/Afg/ahi"; $x ~~ s:g:i/a/r/; say $x'
rbc/rfg/rhi
# greedy pattern
s/<.*>//gs; # try to remove tags, very badly
# non-greedy pattern
s/<.*?>//gs; # try to remove tags, still rather badly
Perl 6 examples of greedy:
perl6 -e 'my $x="abc/def/ghi"; $x ~~ s:|.*"/"||; say $x'
ghi
$ perl6 -e 'my $x="abc/def/ghi"; $x ~~ s:g/.*"/"//; say $x'
ghi
$ perl6 -e 'my $x="abc/def/ghi"; $x ~~ s/.*"/"//; say $x'
ghi
$ perl6 -e 'my $x="abc/def/ghi"; $x ~~ s/.*\///; say $x'
ghi
spaces:
$ perl6 -e 'my $x="abc ghi"; $x ~~ s/.*abc" "//; say $x'
ghi
Replace a tab and a line feed with a space:
$Clipboard ~~ s:global/ "\t" / /;
$Clipboard ~~ s:global/ "\n" / /;
Remove leading and trailing spaces:
perl6 -e 'my $x=" State : abc "; $x ~~ s/.*?" : "//; $x ~~ s/"
".*//; say "<$x>";'
<abc>
my $x=" State : abc "; $x = $x.subst(/.*?" : "/, "").subst(/ " "+
/,""); say "<$x>";
<abc>
Remove the last letter:
$ perl6 -e 'my $x="a b c d "; $x = chop( $x ); say "<$x>";'
<a b c d>
$ perl6 -e 'my $x="a b c d "; $x ~~ s/" "$//; say "<$x>";'
<a b c d>
Note "$" means to match at the end of the string
Multiple of a single test (if $Terminal = xterm OR $Terminal = linux):
if $Terminal ~~ /xterm || linux/
--
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Computers are like air conditioners.
They malfunction when you open windows
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