Your description doesn't match your example. You say you want to fill the area between the 1's with zero's, but in your example, there are three area's between 1's, and out of the three, you replace two of them with 1's.

If your question is, "how do I replace the 0's with 1's", use tr: 

    tr/0/1/

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Abigail

In reply to Re: Creating a fill-in regexp by Abigail-II
in thread Creating a fill-in regexp by jpfarmer

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