How to use Pattern Attribute in Html5

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Pattern Attribute:

 

Pattern attribute is used for input field validation and used  to provide  a regular expression which is used to match  the input fields value whether the value is according to the pattern specified or not.

When user  enter a value in the input field and if the value entered is  not as per the  expected format, then a error is thrown and our form will not submit until user does not provide correct format value.

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How to use Pattern Attribute in Html5