javascript - Confusing with Regular Expressions repeaing parts -

i confused regular expressions repeating parts curly braces. consider following example:

var datetime = /\d{1,2}\/\d{1,2}\/\d{4} \d{1,2}:\d{2}/; console.log(datetime.test("30/1/2003 8:45")); // true

now if change 30 300000 , 45 455555, i'll true again! other parts between outer numbers ok , result expected.

can me find problem?

thanks.

you're not matching beginning , end of string (^ , $) it's finding match anywhere in string still happens, , giving true.

300000/1/2003 8:455555     dd/m/yyyy h:mm

you want

/^\d{1,2}\/\d{1,2}\/\d{4} \d{1,2}:\d{2}$/;

or more exact;

/^(?:0?[1-9]|[12]\d|3[01])\/(?:0?[1-9]|1[0-2])\/\d{4} (?:0?\d|1\d|2[0-3]):[0-5]\d$/;

Sp