How to extract date from string using javascript

Question

How does one extract a date from a string using javascript? It can be in the following formats:

31.07.2014

07.31.2014

2014.07.31 the same format but divi

Answer 1

I think you can use regex for this. The main three expressions that you need are the following:

[0-9]{4} // year
(0[1-9]|1[0-2]) // month
(0[1-9]|[1-2][0-9]|3[0-1]) // day

You can combine these to fit the formats you mentioned, for example, to match "31.07.2014":

(0[1-9]|[1-2][0-9]|3[0-1])\.(0[1-9]|1[0-2])\.[0-9]{4}

Or "31/07/2014":

(0[1-9]|[1-2][0-9]|3[0-1])\/(0[1-9]|1[0-2])\/[0-9]{4}

You can decide which formats you need and create one regex expression separating the formats with the OR operator |.