Update my Regular Expression to allow negatives

[checkai]

here's what I have that does numbers great, I just need to allow for a negative sign as the first input...

function checkcurrency(thefield,s) {
  var iscur = /^\d+(\.\d\d)?$/.test(thefield.value);
  if(iscur) {
    thefield.style.backgroundColor = cok;
    return true;
  } else {
    thefield.style.backgroundColor = cbad;
    if (s != '') { 
      alert(s);
    }
    thefield.focus();
    return false;
  }  
}

"...your mom goes to college..."

 

[checkai]

If I could give myself a star, I would...found the answer...

var iscur = /(-)?\d+(\.\d\d)?$/.test(thefield.value);

"...your mom goes to college..."

 

[kaht]

on a side note you can get rid of the parentheses around the dash, and use the instance operator instead of 2 instances of \d - useful when you'd need to check for large instances of the same character:

var iscur = /-?\d+(\.\d[!]{2}[/!])?$/.test(thefield.value);

-kaht

[small]How spicy would you like your chang sauce? Oh man... I have no idea what's goin' on right now...[/small]