I have a text input field that I want only to accept numbers or the strings "min" and "max"

I am using the javascript replace function and have the code (/[^0-9]/gi,"") that will get rid of all characters that aren't numbers, what do I need to add so that it will still keep the strings min and max?  I thought something like ^min would work but it doesn't seem to do anything.

Regards.

What happens in the following cases:

123min456

1min

max2

minmax

1m2a3x4

 ?

How about doing it in two steps: 1) check to see if the string matches "min" or "max", 2) if it doesn't, replace all non-digits:

var text = "123ef456d";
if(!text.match(/^(?:min|max)$/gi)) {
  text = text.replace(/[^\d]/gi, '');
}