No, but they are being marked as word boundaries, and so they pass the regex I gave before. For the situation you've described, the only obvious solution I can see is to traverse the key list from long to short as I've shown in Re^5: using hashes. Things get messy with replacement lists when your keys are not independent.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.