I am using a AngularJS directive to only allow a user to enter numbers, decimals, and minus signs however I'd like to update it to allow only one dot and one negative sign at the beginning. The following is what I have now but it allows invalid inputs like --1:

val.replace( /[^0-9.-]+/g, '');

I need help fixing the RegEx to allow inputs like -1, .1, -.1, 0.1, and -0.1 but not like --1, 1.1.1, 1-1, -., 1., 1.k, and k.

I managed to only allow one decimal with the following but have struggled with then allowing the negative sign only at the beginning:

val.replace(/[^d*[0-9].d*[0-9]]/g, '');