Re: How do I replace \t and regarding to the alignment requirement ?

in reply to How do I replace \t and regarding to the alignment requirement ?

And without using the @LAST_MATCH_START variable, because I thought it was an evil which tainted any other regex used in the program (though I may be completely mistaken in this)

perl -Mstrict -we 'my $string="random\ttab\tseparated\twords";
sub tab2space{my ($string,$spacing)=@_;
while($string=~/\\t/){
print $string,"\n";
my $index=index($string,"\\t");
$string=~s/\\t/" " x ($index %8)/e;
}
return $string}
for (0..80){print $_ % 10;}
print "\n", tab2space($string) , "\n";'
0123456789012345678901234567890123456789012345678901234567890123456789
+01234567890
random    tab    separated    words
[download]

print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."

Comment on Re: How do I replace \t and regarding to the alignment requirement ? Select or Download Code

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Re^2: How do I replace \t and regarding to the alignment requirement ? by AnomalousMonk (Archbishop) on Apr 22, 2012 at 16:02 UTC
... `@LAST_MATCH_START` variable ... an evil which tainted any other regex ... You may be thinking of `$&` (`$MATCH`) and friends ($` and `$'`). While `@LAST_MATCH_START` (`@-`) may share in the general overhead associated with capturing, I am not aware that it is touched by the evil of `$&` and its ilk. And with 5.10+, the incantation of the /p regex modifier can raise even $` $& $' to purity as the `${^PREMATCH} ${^MATCH} ${^POSTMATCH}` special variables. Oh, happy day!	[reply] [d/l] [select]

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Re^2: How do I replace \t and regarding to the alignment requirement ?
by AnomalousMonk (Archbishop) on Apr 22, 2012 at 16:02 UTC

... @LAST_MATCH_START variable ... an evil which tainted any other regex ...

You may be thinking of $& ($MATCH) and friends ($` and $'). While @LAST_MATCH_START (@-) may share in the general overhead associated with capturing, I am not aware that it is touched by the evil of $& and its ilk. And with 5.10+, the incantation of the /p regex modifier can raise even $` $& $' to purity as the ${^PREMATCH} ${^MATCH} ${^POSTMATCH} special variables. Oh, happy day!

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