Regular expression for validating date

Posted by / 20-Mar-2016 22:37

Regular expression for validating date

For the Intervals API, we’re wrestling with issues surrounding data input validation. This recently became interesting when the matter of date validation came up. Think of them as search patterns and every character entered in a form field is matched against that pattern – the form can only be submitted if the patter and the user-input matches. Say your Google form expects the user to enter their year of birth.In this regex tutorial, we will learn to validate simple date formats e.g. Here, we want to use a regex that simply checks whether the input looks like a date, without trying to eliminate things such as February 31st.Rather regular expressions work character by character. [1-9]› to match 3 followed by 0 or 1, or to match 1 or 2 followed by any digit, or to match an optional 0 followed by 1 to 9. [0-9]$"; Pattern pattern = Pattern.compile(regex); for(String date : dates) Output: 1/1/11 : true 01/01/11 : true 01/01/2011 : true 01/1/2011 : true 1/11/2011 : true 1/11/11 : true 11/1/11 : true List dates = new Array List(); //With leading zeros dates.add("01/01/11"); dates.add("01/01/2011"); //Missing leading zeros dates.add("1/1/11"); dates.add("01/1/2011"); dates.add("1/11/2011"); dates.add("1/11/11"); dates.add("11/1/11"); String regex = "^[0-3][0-9]/[0-3][0-9]/(? Because of this, you have to choose how simple or how accurate you want your regular expression to be. And even if the format is proper, is the data itself valid?

Microsoft is conducting an online survey to understand your opinion of the Technet Web site.Let’s see some regex examples based on different requirements around date formats List dates = new Array List(); dates.add("1/1/11"); dates.add("01/01/11"); dates.add("01/01/2011"); dates.add("01/1/2011"); dates.add("1/11/2011"); dates.add("1/11/11"); dates.add("11/1/11"); String regex = "^[0-3]? Please clarify your specific problem or add additional details to highlight exactly what you need.If you choose to participate, the online survey will be presented to you when you leave the Technet Web site. Your organization has a few vacant positions and you are planning to use the Google Forms service to prepare a pre-interview questionnaire for job applicants.

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Maybe because of invalid format (not conforming to YYYY-MM-DD), maybe because of an invalid value (2015-02-31). The OP's question was not about value validation, but of format validation.