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Postings from March 2002
actually searching on a empty pattern is wrong wrong wrong!
a pattern in a search that evalutes to "" will use the previous successful
pattern match.
so the following:
if($x =~ /pattern/){
print "yes\n" if($y =~ //); ## this really means if($y =~ /pattern/)
if you made it this far
}
__END__
man perlop; #line 1100
If the PATTERN evaluates to the empty string, the
last successfully matched regular expression is used
instead.
-----Original Message-----
From: Jonathan E. Paton [mailto:jonathanpaton@yahoo.com]
Sent: Monday, March 04, 2002 1:29 PM
To: beginners@perl.org
Subject: RE: reading one character at a time
> Is there a perl function that reads one character at
> a time from a string and and returns that character?
There are VERY FEW situations that require this kind of
action... but assuming you have one then the well proven
shortest approach is:
$string = "Hello World";
@string = $string =~ /./g;
OR:
$string = "Hello World";
for ($string =~ /./g) { print $_."\n"}
Split on a null length string is probably more readable,
but this simple technique works for pairs of characters...
and allows you to avoid pack() and unpack() a little
longer!
Take care,
Jonathan Paton
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