Android Java - Validation of Mobile No on text changed using Regular expression

This video demonstrates step by step validation of mobile no on key press on text changed listener using regular expression. Application shown in video is developed in android java. Whenever user enter mobile no less than 10 digit or more than 10 digit button will be disabled and user will get the error message of invalid mobile. Validation using regular expression is given that first digit must be between 6 to 9.

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