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Wanted to Inquire about the possible Regex expression for 24-hour time format in HTML 5 (HH:MM) .
if possible, kindly tell the regex that can be used in the Pattern attribute of HTML 5
The time is expected to be in 24-hour format (HH not more than 23).
Kind regards,
528
In a regular expression, we write this as ‹ 1[0-2]|0?[1-9] ›. On a 24-hour clock, if the first digit is 0 or 1, the second digit allows all 10 digits, but if the first digit is 2, the second digit must be between 0 and 3. In regex syntax, this can be expressed as ‹ 2[0-3]|[01]?[0-9] ›.
On a 12-hour clock, if the first digit is 0, the second digit allows all 10 digits, but if the first digit is 1, the second digit must be 0, 1, or 2. In a regular expression, we write this as ‹ 1[0-2]|0?[1-9] ›.
I think this is a possible approach :
<input type="text" pattern="([01]?[0-9]|2[0-3]):[0-5][0-9]" id="24h"/>
<input type="text" pattern="([01]?[0-9]{1}|2[0-3]{1}):[0-5]{1}[0-9]{1}" id="24h"/>
http://www.mkyong.com/regular-expressions/how-to-validate-time-in-24-hours-format-with-regular-expression/
([01]?[0-9]|2[0-3]):[0-5][0-9]
Check out this jsfiddle : example
105
Here is the code:
<input type="text" pattern="[0-2]{1}[0-9]{1}:[0-5]{1}[0-9]{1}" />
it does allow invalid hour values: 24,25,26,27,28,29, if you want to be extra correct you can do it that way:
<input type="text" pattern="([0-1]{1}[0-9]{1}|20|21|22|23):[0-5]{1}[0-9]{1}" />
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