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3.2: The Match-any-character Operator (.)

This operator matches any single printing or nonprinting character except it won't match a:

newline
if the syntax bit RE_DOT_NEWLINE isn't set.
null
if the syntax bit RE_DOT_NOT_NULL is set.

The . (period) character represents this operator. For example, a.b matches any three-character string beginning with a and ending with b.