Replace first character if it’s 0 from string

Can you please tell me that how to replace 0 from mobile number in expression if its first character. I am getting Mobile numbers in webhook Like (09887012345, 9887012345). So when ever a user input 0 in start then i want to replace it.

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@dpk0021 , assuming the mobile number is referenced by the key mobile_number you can use the expression {{ $json.mobile_number.startsWith('0') ? $json.mobile_number.slice(1) : $json.mobile_number }}.

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