Proposal : List of regular expressions for numeric syntax on different HP calculators

[Jonathan Busby]

I'm interested in the syntax of what the user can enter as a number in various HP calculators. For the HP48 series, I think the regular expression is :

((([+-]?[0-9]+(\.)?[0-9]*)|([+-]?[0-9]*(\.)?[0-9]+))([eE](([+-]?[0-9]+(\.)?[0-9]*)|([+-]?[0-9]*(\.)?[0-9]+)))?)

which is quite convoluted. Here's a short Perl script that presents it in a more understandable way :

Code:

#!/usr/bin/perl

$a = "([+-]?[0-9]+(\\.)?[0-9]*)";
$b = "([+-]?[0-9]*(\\.)?[0-9]+)";
$c = "($a|$b)";
$d = "($c([eE]$c)?)";

while(<STDIN>)
{
    /$d/;
    print $1;
}

I'm interested in how the regular expressions used to match the user entered number formats differ in different HP Calculators. Perhaps we could compile a list of the different regular expressions

Regards,

Jonathan