Regular Expressions provide a very powerful and easy method of client side validation. They are also both supported by IE and Netscape. It takes a lot less code, and works on every browser. Here’s a simple date validation in Javascript?using regular expressions.
function validateDate(input){ var datePattern = /^(d{2})/(d{2})/(d{4})$/; if(!datePattern.test(input)) { alert("Error... please enter date in mm/dd/yyyy format"); return false; } var month = parseInt(RegExp.$1); if(month <=0 || month > 12) { alert("Error.. invalid month"); return false; } var year = parseInt(RegExp.$3); var daysArray = new Array(31,28,31,30,31,30,31,31,30,31,30,31); if(year % 4 == 0) { daysArray[1] = 29; } var date = parseInt(RegExp.$2); if(date <=0 || date > daysArray[month-1]) { alert("Error... invalid date"); return false; } return true;}
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