David Thompson writes:

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Hi Peter,

You are incorrect in your recent Mac article where you
compared shell globbing and regular expressions. You
seemed to imply that globbing was a subset of regular
expression patterns, and this is not true at all.

For example, consider how the asterisk is used in
globbing: it is a wild card for zero or more
characters at the current position. In regular
expressions, an asterisk has an entirely different
meaning: zero or more occurences of the previous
character at the current position.

(Actually, in regular expressions, the asterisk means
zero or more occurences of the previous regular expression, so that [abc]* means any combination of the 3 letters a,b, and c.)

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Of course, this is perfectly true. My intended meaning was that the building of symbolic expressions is deep and wide!

Thanks!

Peter