Translations:Using regular expressions/114/bg
From LimeSurvey Manual
/^(?:(?:00:[0-5][0-9](?[0-5][0-9])? (?:am|сутрин)|(?:0[1-9 ]|1[01]):[0-5][0-9](?[0-5][0-9])? (?:[ap]m|[AP]M)|12:[0 -5][0-9](?[0-5][0-9])? (?:pm|PM))|(?:[01][0-9]|2[0-3]) :[0-5][0-9](?[0-5][0-9])?)$/