How to read line by line of a text area HTML tag

I have a text area where each line contains Integer value like follows

      1234
      4321
     123445

I want to check if the user has really enetered valid values and not some funny values like follows

      1234,
      987l;

For that I need to read line by line of text area and validate that. How can i read line by line of a text area using javascript?

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