On 9/1/06, Mary Anderson <[EMAIL PROTECTED]> wrote:
>Thanks for the tip. I will try it, even though there is another suggestion ($fieldValue eq '') which works! Something can be defined to be '', so that perhaps defined or exists won't always work.
That's why I said it depends on how it was originally assigned. If the other way is working for you, go with that. :)
mary How have you assigned the variables to $fieldValue. > > Try 'exists' or 'defined' > > On 8/31/06, Ashok Varma <[EMAIL PROTECTED]> wrote: > > Hi, > > > > The best approach you go with is use regular expressions, rather that > > comparing them using relational operators. > > > > next unless($fieldValue =~ /(\W|\D)+/); > > > > the above code will check if '$fieldValue' is a non alpha numeric and > starts > > the next iteration if it is not. \W in the above code specifies a > non-word, > > \D specifies a non-digit and + specifies for one or many. > > > > since Perl is a TIMTOWTDI, i have give you one way. but it is always > good > > to go with regular expressions rather than relational operators for > matching > > characters. (FYI, i love Reg Exp's :) jus kidding) > > > > hope this helps. > > Note: i have just given you an example, which may not exactly suit your > > requirement, you have to change it :). i have just given you a hint. > > > > Ashok > > > > On 8/31/06, Owen <[EMAIL PROTECTED]> wrote: > > > > > > On Wed, 30 Aug 2006 15:44:53 -0700 (PDT) > > > "Mary Anderson" <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > Hi All, > > > > I know this isn't strictly a cgi problem, but it is arising in a > cgi > > > > application. I have a loop which reads certain fields, hashed on > names. > > > > Some of my fields hold character strings, some hold numbers. > Sometimes > > > > the number field is a blank. I need a test on the field value > > > $fieldValue > > > > which will tell me if my field was blank regardless of whether it > holds > > > a > > > > character string or a number. > > > > > > > > I would like to say something like > > > > > > > > $fieldValue = (($fieldValue == 0) or $fieldValue) ? $fieldValue : > > > 'null' > > > > > > > > but perl appears to have a strange interpretation of $fieldValue == > 0 if > > > > $fieldValue is a character. > > > > > > > > Thanks > > > > Mary > > > > > > > > I have seen references to a function which will do the trick, > but > > > it > > > > is not mentioned in the camel book. > > > > > > > > > You need to use 'eq' or 'ne' for strings. 0 isn't a string. So you > have to > > > rethink your logic > > > > > > Look up comparison, relational and equality operators. Try perldoc > perlop > > > (not sure) > > > > > > > > > > > > Owen > > > > > > -- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > <http://learn.perl.org/> <http://learn.perl.org/first-response> > > > > > > > > > > > > > > > > -- > ~Tyler > > -- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > <http://learn.perl.org/> <http://learn.perl.org/first-response> > >
-- ~Tyler -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
