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/^\d+$/                      # integer
/^\d+(?:\.\d+)?$/            # integer or optional real
...
# Ways of doing optional integer portion (e.g. .12)
/^\d*(?:\.(?:\d\d)?)?$/           # WRONG (matches "")
/^\d+(?:\.(?:\d\d)?)?$|^\.\d\d$/  # better, but still ugly