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Regex

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'.