[thelist] [JS] regex function vs. plain function

[Tom Dell'Aringa]

Hi folks,

We're using a function that checks for a valid number entry. It works
fine but I am wondering if a regex would be more efficient - it
certainly seems it would be smaller. Here is the function:

-----
// Check for valid number
function isNumber(fieldname, message, fieldLength, setFocus) {
    if (fieldname == null) return "";

    var digits = "0123456789";   
    var field = fieldname.value;
    
    if (field.length==0) return ""; 
    
    if (fieldLength > 0) {
      if (field.length != fieldLength) {
        if (setFocus) fieldname.focus();
        return message;
      }
    }

    for (var i=0; i < field.length; i++) {
        temp = field.substring(i, i+1);
        if ((digits.indexOf(temp) == "-1")) {
            if (setFocus) fieldname.focus();
            return message;
        }
    }
        
    return "";
}
------

Wouldn't this be better as a regex? We have like 3 or 4 of these...

Tom

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