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In this video tutorial, the focus is on mobile number validation, specifically on ensuring that the number has ten digits. In India, a valid number should start with 7 or 8 and consist of only numerical characters. If the number does not meet these criteria, an error message should be displayed. To achieve this validation, a regular expression validator is used from the toolbox. Simply drop the validator onto the mobile number field, paste the expression, and customize the error message. This way, you can easily validate the mobile number input.
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