There are a few points you need to learn about the s/// operator:

• The first part (right after "s/") is called the pattern -- that is what you expect to match in the input string.
• The second part (after "s/pattern/") is called the replacement -- that is what gets put in place of the pattern.
• The value returned by "s/pattern/replace/", is always "1" for true if the pattern matched and was replaced, and "0" for false if it didn't match.

You gave a couple examples of input, but it's not at all clear what you wanted for output. Could you explain a little more about that?

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