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	undef ~~ Maybe[Int] # -> 1
	4 ~~ Maybe[Int]     # -> 1
	"" ~~ Maybe[Int]    # -> ""

=head2 Undef

Only C<undef>.

	undef ~~ Undef # -> 1
	0 ~~ Undef     # -> ""

=head2 Defined

Everything except C<undef>.

	\0 ~~ Defined    # -> 1
	undef ~~ Defined # -> ""

=head2 Value

Defined values without references.

	3 ~~ Value  # -> 1
	\3 ~~ Value    # -> ""
	undef ~~ Value # -> ""

=head2 Len[from, to?]

Specifies a length value from C<from> to C<to>, or from 0 to C<from> if C<to> is missing.

	"1234" ~~ Len[3]   # -> ""
	"123" ~~ Len[3]    # -> 1
	"12" ~~ Len[3]     # -> 1
	"" ~~ Len[1, 2]    # -> ""
	"1" ~~ Len[1, 2]   # -> 1
	"12" ~~ Len[1, 2]  # -> 1
	"123" ~~ Len[1, 2] # -> ""

=head2 Version

Perl version.

	1.1.0 ~~ Version   # -> 1
	v1.1.0 ~~ Version  # -> 1
	v1.1 ~~ Version    # -> 1
	v1 ~~ Version      # -> 1
	1.1 ~~ Version     # -> ""
	"1.1.0" ~~ Version # -> ""

=head2 Str

Strings, including numbers.

	1.1 ~~ Str   # -> 1
	"" ~~ Str    # -> 1
	1.1.0 ~~ Str # -> ""

=head2 Uni

Unicode strings with the utf8 flag or if decoding to utf8 occurs without errors.

	"↭" ~~ Uni # -> 1
	123 ~~ Uni # -> ""
	do {no utf8; "↭" ~~ Uni} # -> 1

=head2 Bin

Binary strings without the utf8 flag and octets with numbers less than 128.

	123 ~~ Bin # -> 1
	"z" ~~ Bin # -> 1
	"↭" ~~ Bin # -> ""
	do {no utf8; "↭" ~~ Bin }   # -> ""

=head2 StartsWith[begin]

The line starts with C<begin>.

	"Hi, world!" ~~ StartsWith["Hi,"]; # -> 1
	"Hi world!" ~~ StartsWith["Hi,"];  # -> ""

=head2 EndsWith[end]

The line ends with C<end>.

	"Hi, world!" ~~ EndsWith["world!"]; # -> 1
	"Hi, world" ~~ EndsWith["world!"];  # -> ""

=head2 NonEmptyStr

A string containing one or more non-blank characters.

	" " ~~ NonEmptyStr              # -> ""
	" S " ~~ NonEmptyStr            # -> 1
	" S " ~~ (NonEmptyStr & Len[2]) # -> ""

=head2 Email

Lines with C<@>.

	'@' ~~ Email     # -> 1
	'a@a.a' ~~ Email # -> 1
	'a.a' ~~ Email   # -> ""

=head2 Tel

The telephone format is a plus sign and seven or more digits.

	"+1234567" ~~ Tel  # -> 1
	"+1234568" ~~ Tel  # -> 1
	"+ 1234567" ~~ Tel # -> ""
	"+1234567 " ~~ Tel # -> ""

=head2 Url

Website URLs are a string prefixed with http:// or https://.

	"http://" ~~ Url # -> 1
	"http:/" ~~ Url  # -> ""

=head2 Path

Paths start with a slash.

	"/" ~~ Path  # -> 1
	"/a/b" ~~ Path  # -> 1
	"a/b" ~~ Path   # -> ""