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hey guys hey gone my name is DOM and today I want to take you through the new html5 pattern attribute so essentially this new attribute allows you to perform some client-side validation in the form of regular expression patterns so you can apply your own regular expression patterns to your input fields and then your clients must actually enter the correct pattern before the form is submitted so it works very similar to the input type of email and also the required attribute okay so we have here a user name field and we can use this new pattern to say well this field must contain only characters numbers and periods and also be between 6 and 12 characters long so lets do this using the html5 pattern attribute so inside my text editor we can see here Ive got just a essential form and the input field inside here so lets go ahead and add the pattern attribute to the input field alright so down here lets say Paran is equal to and this is where you put your regular expression pattern so