Re: The map function

Gerry Ford wrote:
"Jürgen Exner" <jurgenex@xxxxxxxxxxx> wrote in message news:21mr04pro5k3sqjbebv5g2jq5i0doq42t3@xxxxxxxxxx
However, I wonder what you are trying to achive by using eval in the
first place. I don't see any need for it.

I could just omit it?

It's up to you; I for one do see a need for it: It prevents a fatal error for the case a line is not a valid regular expression.

C:\home>type test.pl
my @filter;
while (<DATA>) {
chomp;
next unless length;
next if /^#/o;
my $pat;
eval '$pat = qr($_)' or do { warn $@; next };
push @filter, $pat;
}
print "$_\n" foreach @filter;

__DATA__
\w+).+?
\s+

C:\home>test.pl
Unmatched ) in regex; marked by <-- HERE in m/\w+) <-- HERE .+?/ at (eval 1) line 1, <DATA> line 1.
(?-xism:\s+)

C:\home>

--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
.

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