Javascript function for validating numbers

Whole countries come and go, introducing new country prefixes.New classifications of numbers introduce new numbering systems – premium-rate, local-rate, toll-free, and so on.It not only allows leaving off the cents, but will accept part of a decimal: the decimal point followed by zero, one, or two digits.

The second regular expression is nearly the same as the first with one difference.

A regular expression to check that would look like this: These regular expressions are similar to the three above.

The only changes are: a call to alltrim an expression covered earlier and the symbols [- ]? Decimals or floats as they are commonly called present additional considerations.

There is nothing really tricky in the first regular expression. It requires the first digit not to be zero, and that can be followed by zero, one, or two digits.

After that there can be zero or more groups composed of a comma and exactly three digits.

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