RegEx - Time Validation ((h)h:mm)

Question

/^\\d{1,2}[:][0-5][0-9]$/

is what I have. this limits minutes to 00-59. It does not, however, limit hours to between 0 and 12. For similarity and unifo

Answer 1

Thanks!!! I use this Javascript code now:

function Check_arrival(time) { //Assuming you are working in 12 hour time, 0 is not a valid var patt = new RegExp("^(0?[1-9]|1[012]):[0-5][0-9]$"); var res = patt.test(time); return res; }

res=true|false

Answer 2

/^(10|11|12|[1-9]):[0-5][0-9]$/

I don't think that you want 0:50 as a valid time either.

Answer 3

The 0 - 9 and 10 - 12 cases need to be treated separately. (The two rules can be combined with |.)

/^(?:0?\d|1[012]):[0-5]\d$/

Here

• (?:…) is a non-capturing group
• x|y means match either pattern
• 0?\d matches 0 - 9 or 00 - 09
• 1[012] matches 10 - 12.

Answer 4

This is perfect: ^0?([0-9][0-2]?):[0-5][0-9]$

Note: 12 Hr Clock Only

For Times like: 0:01- 12:59

or

00:01 - 12:59

Answer 5

For folks looking for 24h format matching,

hh:mm:ss or h:mm:ss :

status = /^(2[0-3]|[0-1]?[\d]):[0-5][\d]:[0-5][\d]$/.test(timestr)

hh:mm or h:mm :

status = /^(2[0-3]|[0-1]?[\d]):[0-5][\d]$/.test(timestr)

This site is great for testing out: https://www.regexpal.com/

Addedum: Explanation for completeness:

• ^ : start of string, $ : end of string. So we put the expression in a ^..$ block to ensure there's nothing outside of our pattern.
• (2[0-3]|[0-1]?[\d]) : translates to 2[0-3] OR [0-1]?[\d]
• 2[0-3] : 20, 21, 22, 23
• [0-1]?[\d] : 0 or 1 or nothing (?) followed by any single digit(\d). So, this works for numbers from 0 to 19.
• : just that character
• [0-5][\d] : number from 00 to 59. Note: this won't tolerate single-digit in the mm place.

Answer 6

Assuming you are working in 12 hour time, 0 is not a valid hour and should also be excluded (as pointed out by Jon). Here is a basic solution:

/^(0?[1-9]|1[012]):[0-5][0-9]$/

A 24-hour time regex matcher that works similarly:

/^([01]?[0-9]|2[0-3]):[0-5][0-9]$/