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Removing dots

by Anonymous Monk
on May 08, 2005 at 13:49 UTC ( #454999=perlquestion: print w/ replies, xml ) Need Help??
Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I would like to remove the dots from Hello.1.txt ie Hello1.txt. How do i do so?

Comment on Removing dots
Re: Removing dots
by tlm (Prior) on May 08, 2005 at 14:06 UTC

    It's hard to say what the best solution would be without knowing exactly what dots you don't want removed, but for the example you give,

    s/\.//;
    does the job. Or
    s/\.(?!txt$)//g
    ...or
    s/\.(?![^.]+$)//g

    the lowliest monk

      ok let's say if i want it to look like Hello.1txt would s/\.(?=txt$)//g do the job?

        You can get your answer more quickly by firing up the debugger and just trying it out:

        % perl -de 1 DB<1> $s = 'Hello.1.txt' DB<2> $s =~ s/\.(?=txt$)//g # in this case the /g is superfluous DB<3> p $s Hello.1txt
        And faster still (in the long run) if you just study perlre.

        the lowliest monk

        If you really want to remove all but the first occurance:

        $filename =~ /\./; substr($filename, $-[0]+1) =~ s/\.//g if @-;

Re: Removing dots
by Dietz (Curate) on May 08, 2005 at 14:11 UTC
    This would remove all dots except the rightmost one:
    s/\.(?=.*\.)//g;

    A single dot occuring only once in the string will not be removed.
Re: Removing dots
by davidrw (Prior) on May 08, 2005 at 14:47 UTC
    If it's just the base name you need to manipulate (i.e. leave the '.txt. intact), can take advantage of File::Basename to parse that section for you, then do what you want with it. That way the regex is simple because it doesn't have to deal w/the exception of the extension.
    # given: $fullname, @suffixlist (see pod for latter) use File::Basename; my ($name,$path,$suffix) = fileparse($fullname,@suffixlist); $name =~ s/\.//g; my $new_fullname = $path . $name . $suffix;
Re: Removing dots
by Angharad (Pilgrim) on May 08, 2005 at 14:53 UTC
    How about using a combination of substring and then cat the resulting variables together?
Re: Removing dots
by ambrus (Abbot) on May 08, 2005 at 16:09 UTC
Re: Removing dots
by mattk (Pilgrim) on May 08, 2005 at 23:15 UTC
    Just because I felt like doing something different than an RE:
    $origfile = shift; @chunks = split(/\./, $origfile); $ext = pop @chunks; $filename = join("", @chunks, ".$ext"); rename $origfile, $filename;

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