How can I check if a value is a number?

Question

I want to simply check if a returned value from a form text field is a number i.e.: 12 , 12.5 or 12.75. Is there a simple way to check this, especially if the value is pulled as a `param`?

Accepted Answer

Just regexp it, it's trivial, and not worth thinking about beyond that:

```
v =~ /\A[-+]?[0-9]*\.?[0-9]+\Z/
```

(Fixed as per Justin's comment)

How can I check if a value is a number?

Solution

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