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reading numbers as symbols
I'm fishing for zip codes in large email files, and I would like to read
preserving leading zeros in numbers.
I wrote a function that looks for potnums in strings and puts || escapes
around them. It works, but it is inelegant and inefficient to have to read
strings, then escape the potential numbers, then read-from-string.
I would prefer to get the reader to treat all tokens that are potential
numbers as symbols. Something like setting the *read-base* to 0 :-).
Is there some straightforward way to do this that I missed?