in reply to How can I encode a string using only lower case letters and numbers?

Perhaps MIME::Base32?

Author says:
# RFC forces the [A-Z2-7] RFC-3548 compliant encoding
# default encoding [0-9A-V] is for backward compatibility with pre v1.0
Update: use MIME::Base32; (without the 'RFC') gives you the old behaviour (0-9A-V) if you want the 0-9 digit range... perhaps together with lc?
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