strip only the numbers from any formatted string of phone number
This is a method which returns a string contains numbers init.The phone numbers may contain in differnt formats Ex: (123) 456-7890
123-456-7890
so we can read these type of characters and returns only the numbers using java method isDigit from Character class.
123-456-7890
so we can read these type of characters and returns only the numbers using java method isDigit from Character class.
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