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Of course, in order to confirm your assumption about the ‘piiRegex’ variable, I would need to actually see the part of your code that defines and uses it. However, based on your description, it does sound like it could be a regular expression designed to match the pattern of an email address. The reason the substitution only works when the pattern matches a real email is likely because the ‘piiRegex’ looks for patterns that follow a specific structure – the structure of an email address. As for the rest of your code, without being able to see it inside the brackets ‘[Insert Code]’ in your post, I unfortunately can’t provide any specific feedback or confirmation.
