I have several strings to analyze.  The strings are the names of a list
of things that were once ordered and now are not.  A typical array of
names might look like this:

item001
item004
item002
item002b
item002C
item 5
item 10
itemize this

I want to parse these names and determine that "item" is the common
prefix.

I know how to armstrong my way through it a character at a time, but I'm
thinking that Ruby probably has a very elegant way of doing this that
I'm not familiar with yet.

Thanks, Todd
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