Regular Expression for MM/DD/YYYY in Javascript

Question

I\'ve just written this regular expression in javaScript however it doesn\'t seem to work, here\'s my function:

function isGoodDate(dt){
    var reGoodDate =         


        

Answer 1

Attention, before you copy+paste: The question contains some syntactic errors in its regex. This answer is correcting the syntax. It is not claiming to be the best regex for date/time parsing.

Try this:

function isGoodDate(dt){
    var reGoodDate = /^((0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2})*$/;
    return reGoodDate.test(dt);
}

You either declare a regular expression with:

new RegExp("^((0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2})*$")

Or:

/^((0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2})*$/

Notice the /