Re: Regex issues

I dislike using regexes when simple string functions can handle the job.

By extracting the magic delimiter characters into a predefined constant, the code is clearer and more easily extendable. split will partition an input string on any of those special characters, and the wrapper (xx)[0] extracts the first element from the resulting list.


my @DELIMS = (qw( _ @ ));

for my $elem ( @inputs ) {
    push @result, ( split /[@DELIM]/, $elem )[0];
}
[download]

As Occam said: Entia non sunt multiplicanda praeter necessitatem.

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Re^2: Regex issues by AnomalousMonk (Archbishop) on Jul 13, 2013 at 13:05 UTC
`my @DELIMS = (qw( _ @ )); ... ... /[@DELIM]/ ...` [download] If the default value of `$"` is unchanged, the array `@DELIMS` will be interpolated into the regex character class with an extraneous space character, which is then a valid part of the class: a bug waiting to happen. Locally set `$"` to the empty string or, better yet, use join to form the char class string. `>perl -wMstrict -le "my @DELIMS = (qw( _ @ )); ;; my $rx = qr{[@DELIMS]}; print $rx; ;; { local $\" = ''; $rx = qr{[@DELIMS]}; } print $rx; ;; my $cc = join '', @DELIMS; $rx = qr{[$cc]}; print $rx; " (?^:[_ @]) (?^:[_@]) (?^:[_@])` [download] Do not multiply bugs without necessity!	[reply] [d/l] [select]
Re^2: Regex issues by Anonymous Monk on Jul 13, 2013 at 08:02 UTC
... I dislike using regexes.. But your usage of "split" `... split /[@DELIM]/, $elem ..` is still regexes... Or you say otherwise?	[reply] [d/l]


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