On Sun, 18 Apr 2010 17:09:59 +0100
Mimi Cafe <mimic...@googlemail.com> wrote:
> I am trying to test user input to ensure it contains special
> character or symbols that could cause problems to my program or
> database.
>
> The user will enter a keyword in the web form to search in my
> database, and I want to ensure I don't play around with special
> character otherwise any word or phrase is valid.
>
> I have changed my regex several times, but still doesn't work and now
> I have something bizarre and it doesn't work either.
>
>
> $string !~ /^[A-Za-z0-9]+/ # did not work when 2 words are supplied.
> $string !~ /(^[A-Za-z0-9])+\s*$1/ # did not work.
>
> if ($string =~ /!|\$|%|\?|\^|\+|@|'|\\||/){ # doesn't work.
You might want to simply remove theses characters,
$string =~ s/[`\\"|!$\^&\...@#?><\s]//g <---an example only
>
> Any idea how to match this properly?
Try one of the posix character classes.[[:class]] where class would
probably be alnum (See http://perldoc.perl.org/perlre.html )
If the data base contains names like O'Rourke, then you might have to
rethink your database or add the ' to the list of allowed characters
Owen
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