Kevin Viel schreef:
> [.] matches .
> [?] matches ?
> [*] matches *
>
> Can they be combined?
>
> [.*]
Yes, and that looks better than (?:\.|\*), but could actually be
somewhat slower.
(not slower in Perl 5.10 though)
--
Affijn, Ruud
"Gewoon is een tijger."
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On 10/18/07, Kevin Viel <[EMAIL PROTECTED]> wrote:
snip
> Are these character classes that have single elements? In other words:
>
> [.] matches .
> [?] matches ?
> [*] matches *
>
> Can they be combined?
>
> [.*]
snip
Yes, that last example is a character class that will match '.' or '*'.
--
T
> -Original Message-
> From: Dr.Ruud [mailto:[EMAIL PROTECTED]
> Sent: Thursday, October 18, 2007 3:03 AM
> To: beginners@perl.org
> Subject: Re: Overlapping substitution
> I started using "[.]" and "[?]" and "[*]" etc., in procmail recipes
"Chas. Owens" schreef:
> The brackets are being used because some people find [.] easier to
> read than \..
Yes, I do that for expressions that are not in a loop that runs a
zillion times, this because in Perl up to 5.8.8 the "[.]" is a bit less
fast than "\.".
In Perl 5.10 this difference is gon
On 10/16/07, Kevin Viel <[EMAIL PROTECTED]> wrote:
snip
> > If the first field can be just a dot too, consider this:
> >
> > s/ (\A|,) [.] (?=,|\z) /$1/xg
> ^ ^ ^^
> > (if you chomp first :)
>
> Thank you kindly for your response. Are the spaces, which I highlighted
> with c
> -Original Message-
> From: Dr.Ruud [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, October 16, 2007 3:57 PM
> To: beginners@perl.org
> Subject: Re: Overlapping substitution
>
>
> If the first field can be just a dot too, consider this:
>
>
Kevin Viel schreef:
> I have to change the a CSV file, which represents numeric missing
> data with a period (.). For instance:
>
> One,.,.,.
>
> Should be:
>
> One,,,
If the first field can be just a dot too, consider this:
s/ (\A|,) [.] (?=,|\z) /$1/xg
(if you chomp first :)
--
Affi
Hi,
I think that you are looking for a "zero-width positive lookahead assertion"
i.e. (?=...)
So a solution for problem might be:
my $line = ",.,.,.";
$line =~ s/,\.(?=,|$)/,/g;
TTFN
Yaron Kahanovitch
- Original Message -
From: "Kevin Viel" <[EMAIL PROTECTED]>
To: beginners@perl.or
> -Original Message-
> From: Jenda Krynicky [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, October 16, 2007 2:24 AM
> To: beginners@perl.org
> Subject: Re: Overlapping substitution
> $s = 'One,.,.,.';
> $s =~ s/,\.(?=,|$)/,/g;
> print $s;
Diky moc. F
On 15 Oct 2007 at 14:19, Kevin Viel wrote:
> I have to change the a CSV file, which represents numeric missing data
> with a period (.). For instance:
>
> One,.,.,.
>
> Should be:
>
> One,,,
>
> I have written:
>
>
> $_ =~ s/,\.,/,,/g ;
>
>
> However, I have a requirement to substitute ov
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