Mandar Rahurkar wrote:
>
> Hi,
Hello,
> I am trying to remove from file :
> 1. all characters but any alphabet and numbers (i.e., file shd not contain
> anything
> but "alphabets and numbers" that means NO punctuation etc...
Do you consider these
"��������������������������������������������������������������" to be
"alphabet" or just A-Za-z?
> 2. all trailing spaces should be made to one space.
>
> following code doesnt seem to work for objective [1] mentioned above.
> Can anyone please point whats wrong with the
> second line and what changes should I make ?
>
> ---
> open(fp,$file) or die "Cant open $file :$!\n";
> @cont=<fp>;
>
> for(@cont) {
> tr/A-Z/a-z/; # converts all uppercase to lowercase
If you want alphabetic characters other than A-Za-z use:
$_ = lc;
> s/^[a-z0-9]+/ /; # substitute all non alphabets and numbers by space
> s/\s+/ /g; # removes trailing spaces
The first substitution should have been s/[^a-z0-9]+/ /g and the second
substitution isn't required at all or you could have done it like this:
tr/a-z0-9/ /cs;
Or if you are using alphabetic characters other than A-Za-z use:
s/[^[:alnum:]]+/ /g;
> }
John
--
use Perl;
program
fulfillment
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