Validate time format hh:mm:ss.ms with regEx JavaScript? [duplicate]

Question

I created function that should validate user input. The value should only be accepted as valid if format is matching this hh:mm:ss.s. Here is the function:

function time_format(time_val) {
   let regEx = new RegExp('/^([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(:|\.)\d{2}?$/');
   console.log(time_val);
   console.log(regEx.test(time_val));
};

console.log(time_format('00:00:00.0'));
console.log(time_format('05:35:23.7'));
console.log(time_format('25:17:07.0'));

All three values failed the test above. First and second format should pass the regex. The third should fail since the hours are not valid. If anyone knows how this can be fixed please let me know.

Remove new RegExp(' and the last '). Instead of (:|\.), use [:.] — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Oct 22, 2020 at 13:27
@WiktorStribiżew I removed the characters you suggested. Now it looks like this: let regEx = /^([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(:|\.)\d{2}?$/; the test still failed. — espresso_coffee
– espresso_coffee, Commented Oct 22, 2020 at 13:28
Yes, last digit matching pattern must be \d{1,2} or \d+. It depends on what your requirements are. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Oct 22, 2020 at 13:39

Guile · Accepted Answer · 2020-10-22 13:30:58Z

4

Try this…

function time_format(time_val) {
   let regEx = /^([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(:|\.)\d{1,2}?$/;
   console.log(time_val);
   console.log(regEx.test(time_val));
};

console.log(time_format('00:00:00.0'));
console.log(time_format('05:35:23.7'));
console.log(time_format('25:17:07.0'));

answered Oct 22, 2020 at 13:30

Guile

1,5041 gold badge12 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Cristofayre Over a year ago

Thanks. A little rejigging of the last part, and it now reads milliseconds to 3 digits. (Downloaded a regex from another site, and it ran out of memory / corrupted Firefox profile / made Windows take 15mins to boot ! (It also took out my wireless dongle - or did that failing take out everything else ???)

Collectives™ on Stack Overflow

Validate time format hh:mm:ss.ms with regEx JavaScript? [duplicate]

1 Answer 1

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Linked

Related