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I have String say Str it usually has a 10 digit number..how to test it contains numbers between 0-9 only
 
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Have you read the documentation for Pattern and gone through this tutorial? What have you tried and what was the result?
 
My first bit of advice is that if you are going to be a mime, you shouldn't talk. Even the tiny ad is nodding:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com
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