I want to validate a time with a regex. I created the following expression :
'#^([01][0-9])|(2[0-4])(:[0-5][0-9]){1,2}$#'
Here is the problem:
<?php
var_dump(preg_match('#^([01][0-9])|(2[0-4])(:[0-5][0-9]){1,2}$#', '14:25'));
// Returns 1 (OK)
var_dump(preg_match('#^([01][0-9])|(2[0-4])(:[0-5][0-9]){1,2}$#', '25:25'));
// Returns 0 (OK)
var_dump(preg_match('#^([01][0-9])|(2[0-4])(:[0-5][0-9]){1,2}$#', '14:2555'));
// Returns 1 (instead of 0 as I would like to get)
?>
Does anybody know what is wrong?
Time in 24-Hour format regular expression pattern :
([01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?
The 24-hour clock format is start from 0-23 or 00-23 then a semi colon (:) and follow by 00-59 then (optionally a semi colon (:) and follow by 00-59).
Description :
( # start of group #1
[01]?[0-9] # start with 0-9,1-9,00-09,10-19
| # or
2[0-3] # start with 20-23
) # end of group #1
: # follow by a semi colon (:)
[0-5][0-9] # follow by 0..5 and 0..9, which means 00 to 59
( # start of group #2
: # follow by a semi colon (:)
[0-5][0-9] # follow by 0..5 and 0..9, which means 00 to 59
) # end of group #2
? # optional third part
Matching time formats :
01:00, 02:00, 13:00,
1:00, 2:00, 13:01,
23:59, 15:00,
00:00, 0:00,
14:34:43, 01:00:00
Not matching time formats :
24:00 # hour is out of range [0-23]
12:60 # minute is out of range [00-59]
0:0 # invalid format for minute, at least 2 digits
13:1 # invalid format for minute, at least 2 digits
0:00:0 # invalid format for seconds, at least 2 digits
101:00 # hour is out of range [0-23]
Example :
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '14:25')); // OK
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '25:25')); // KO
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '25:30')); // KO
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '14:2555')); // KO
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '14:65')); // KO
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '14:59')); // OK
var_dump(preg_match('#^[01]?[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?$#', '14:34:43')); // OK
^(([0-1][0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?)$
This will get from 00:00 to 23:59 and 00:00:00 to 23:59:59.
Alternation is a low-precedence operator, so wrap it in a non-capture group:
#^(?:([01][0-9])|(2[0-3]))(:[0-5][0-9]){1,2}$#
+++ +
See demo here.
/(0[0-9]|1[0-9]|2[0-3]):[0-5][0-9](:[0-5][0-9])?/
This will allow 00:00 or 00:00:00 as well, some of the others here don't.
It also limits the time to 00:00:00 to 23:59:59 or 23:59, some of the others allow 24:00 or 25:00, etc.