Hi All,
I'm trying to use preg_match to validate that a time input is in this format - "HH:MM"
+4
A:
preg_match("/(1[012]|0[0-9]):[0-5][0-9]/", $foo)
for 12-hour or
preg_match("/(2[0-3]|[01][0-9]):[0-5][0-9]/", $foo)
for 24-hour.
Charles
2010-10-19 02:51:58
+1 for a specific and concise regex.
Jason McCreary
2010-10-19 02:56:11
can you guys please explain how your answer work? I'd like to not only get an answer from you guys, but also try to learn regex.
Catfish
2010-10-19 02:57:01
The parentheses before the colon (':') in this instance are so we're able to use | ('or' operator). [0-9] means "a number between 0 and 9". So essentially, the above regex can be explained like this:`(2[0,1,2,3] OR [0,1][0,1,2,3,4,5,6,7,8,9])` `:` `[0,1,2,3,4,5][0,1,2,3,4,5,6,7,8,9])`.
Ashley Williams
2010-10-19 03:13:45
this actually doesn't work for anything 12:xx. doesn't work for 12:00 or 12:30 etc.
Catfish
2010-10-19 23:05:52
I used the 12 hour version.
Catfish
2010-10-19 23:06:10
simple fix. Just changed "/(1[01]|... to "/(1[0-2]|
Catfish
2010-10-19 23:16:22
+1
A:
You can do:
if(preg_match('/^(?:[01][0-9]|2[0-3]):[0-5][0-9]$/',$input)) {
// $input is valid HH:MM format.
}
codaddict
2010-10-19 02:53:11
This would allow 24:59. That's not a valid time. Furthermore, why aren't you capturing the hour and minute?
Jason McCreary
2010-10-19 02:57:44
A:
You can do this with a preg_match(), but I'd have to be a very specific regular expression. Otherwise 77:99 would be a valid time.
My suggestion would be to explode() the string on the : and then use PHP's date functions to validate the rest and get yourself a timestamp back.
Jason McCreary
2010-10-19 02:54:00