javascript hour: minute regular expression

/**
*Hours:minute regular expression check<br>
* <br>
* @param pInput string to check
* @return boolean Returns the check result
*/
public static boolean isUrl (String pInput) {
if(pInput == null){
return false;
}
String regEx = " ^([0-1]{1}\d|2[0-3]):([0-5]\d)$";

Pattern p = (regEx);
Matcher matcher = (pInput);
return ();
}