Just a side note. You wrote:

The first parameter to split is always a regexp even if you write a string (unless that string happens to be a single space).

A single space also results in (the equivalent of) a regex in split. The difference is that the regex is not the string itself (/ /) but /\s+/. Specifying ' ' is an alternaive way of invoking the default which is to split on white space.

Anno

In reply to Re^2: Is it possible to split a hash key? by Anno
in thread Is it possible to split a hash key? by dbmathis

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