[Melbourne-pm] Handling line ending characters

[Ben Hare]

all you should need on the Perl side is something like:

$str =~ s/[\r\n]*$//;

also see perldoc -f chomp

other common cleaning functions are:

$str =~ s/^\s*//;

and / or

$str =~ s/\s*$//;

some for modules have functions to do this sort of thing for you also.

Ben.


On 2 November 2012 13:29, Stephen Edmonds <stephen.edmonds at monash.edu> wrote:
> I was wondering what techniques people use to handle getting different line
> ending characters from various sources.
>
> The specific example I have in mind is a field on a web form. The field uses
> jQuery to check client side that the input is less than 100 characters, and
> then we check again on the server side in perl.  If the form is submitted
> from Windows, then you get two characters per line ending. jQuery converts
> these to a single character it may think that the text is ok at 99
> characters, but the two characters per line ending are actually submitted,
> so our server side check may think it is (for eg) 103 characters and error.
>
> It is an edge case where client side validation doesn't match the server
> side validation.
>
> One common solution seems to be to go to a regex with \r?\n, \015?\012, etc,
> while another option is to use  Encode::Newlines (which does do regexes
> internally, but maintaining that is not our concern)
>
> A further question is do we convert the line endings for the validation and
> still store the originally submitted text, or do we store a converted
> version?
>
> How do people handle this?
>
> Thanks,
> Stephen
>
> --
> Stephen Edmonds
> Technical Lead Applications
> Production manager for my.monash, Blackboard and Google Apps
> eSolutions, Monash University
>
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> Melbourne-pm at pm.org
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-- 
Benjamin J. Hare
Professional Web Development Services
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