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Of course, if you encounter pieces of code that use the old-style string substitutions, you will want to replace them with new-style ones. Regular expressions come to the rescue:

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The Search term starts with the double percent sign that indicates the start of a string substitution. The [^%"]+ means a series of one or more characters that are not percent signs or double quote characters. This part of the Search term is inside parentheses, because that makes it possible to refer to it in the Replace term – or more accurately, refer to whatever it matches. The regular expression ends with the three percent signs that indicate the end of an old-style string substitution.