Question: Write the code required to insert the word not after each occurrence of is in the following string: This sentence is a test, is it

Write the code required to insert the word \"not\" after each occurrence of \"is\" in the following string: \"This sentence is a test, is it not?\". How many occurrences of \"is\" does the code find?

Modify the code written in so that it only matches occurrences of \"is\" that are surrounded by whitespace.

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