##   Metacharacter tests
.			a		y	dot (.)
.			\n		n	dot (.)
.			''		n	dot (.)
a\s+f			abcdef		n	whitespace (\s)
ab\s+cdef		ab  cdef	y	whitespace (\s)
a\S+f			abcdef		y	not whitespace (\S)
a\S+f			ab cdef		n	not whitespace (\S)
^abc			abcdef		y	start and end of string (^)
^abc			abc\ndef	y	start and end of string (^)
^abc			def\nabc	n	start and end of string (^)
def\n^abc		def\nabc	n	start and end of string (^)
def$			abcdef		y	start and end of string ($)
def$			abc\ndef	y	start and end of string ($)
def$			def\nabc	n	start and end of string ($)
def$\nabc		def\nabc	n	start and end of string (^)
abc\n$		abc\n		y	end of string ($)
abc$			abc\n		y	end of string with newline ($)
c\nd			abc\ndef	y	logical newline (\n)
c\nd			abc\rdef	y	logical newline matches \r
c\n+d			abc\n\ndef	y	logical newline quantified
a\n+f			abcdef		n	logical newline (\n)
c\nd			abc\n\rdef	n	logical newline matches \n\r
c\nd			abc\r\ndef	y	logical newline matches \r\n
b\nc			abc\ndef	n	logical newline (\n)
\N			a		y	not logical newline (\N)
a\Nc			abc		y	not logical newline (\N)
\N			''		n	not logical newline (\N)
c\Nd			abc\ndef	n	not logical newline (\N)
c\Nd			abc\rdef	n	not logical newline (\N)
c\N+d			abc\n\ndef	n	not logical newline (\N)
a\N+f			abcdef		y	not logical newline (\N)
c\Nd			abc\n\rdef	n	not logical newline (\N)
c\Nd			abc\r\ndef	n	not logical newline (\N)
b\N\n			abc\ndef	y	not logical newline (\N)
[a-d]|[b-e]	c		y	alternation (|)
[a-d]|[d-e]	c		y	alternation (|)
[a-b]|[b-e]	c		y	alternation (|)
[a-b]|[d-e]	c		n	alternation (|)
[a-d]+|[b-e]+	bcd		y	alternation (|)
a\w+f			a=[ *f		n	word character
a\w+f			abcdef		y	word character
a\W+f			a&%- f		y	not word character
a\W+f			abcdef		n	not word character
a\d+f			abcdef		n	digit
ab\d+cdef		ab42cdef	y	digit
a\D+f			abcdef		y	not digit
a\D+f			ab0cdef		n	not digit
\Ba\B			a-		n	not boundary
a\Z				a\n		y	basic \Z + (1)
a\Z				a		y	basic \Z + (2)
a\Z				ab		n	basic \Z - (1)
a\Z				a\nb	n	basic \Z - (2)
a\z				a		y	basic \z +
a\z				a\n		n	basic \z - (1)
a\z				a\nb	n	basic \z - (2)
a\x6565				ae65	y	\x
a\x{65}				ae	y	\x{}