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	0 for end of file, and \-1 for an error.			0 for end of file, and \-1 for an error.
	.PP			.PP
	Patterns are arbitrary Boolean combinations			Patterns are arbitrary Boolean combinations
	(with			(with
	.BR "! \|\| &&" )			.BR "! \|\| &&" )
	of regular expressions and			of regular expressions and
	relational expressions.			relational expressions.
	Regular expressions are as in			Regular expressions are as in
	.IR egrep ;			.IR egrep (1)
	see			except numeric quantifiers are not supported beyond the basic
	.IR grep (1).			.B +
				and
				.B ?
				for quantities \&\f(CW"0 or 1"\fP and \&\f(CW"1 or more"\fP
				respectively.
	Isolated regular expressions			Isolated regular expressions
	in a pattern apply to the entire line.			in a pattern apply to the entire line.
	Regular expressions may also occur in			Regular expressions may also occur in
	relational expressions, using the operators			relational expressions, using the operators
	.BR ~			.BR ~
	and			and
	.BR !~ .			.BR !~ .
	.BI / re /			.BI / re /
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