mat!(uni_literal, r"☃", "☃", Some((0, 3)));
mat!(uni_literal_plus, r"☃+", "☃", Some((0, 3)));
mat!(uni_literal_casei_plus, r"(?i)☃+", "☃", Some((0, 3)));
mat!(uni_class_plus, r"[☃Ⅰ]+", "☃", Some((0, 3)));
mat!(uni_one, r"\pN", "Ⅰ", Some((0, 3)));
mat!(uni_mixed, r"\pN+", "Ⅰ1Ⅱ2", Some((0, 8)));
mat!(uni_not, r"\PN+", "abⅠ", Some((0, 2)));
mat!(uni_not_class, r"[\PN]+", "abⅠ", Some((0, 2)));
mat!(uni_not_class_neg, r"[^\PN]+", "abⅠ", Some((2, 5)));
mat!(uni_case, r"(?i)Δ", "δ", Some((0, 2)));
mat!(uni_case_upper, r"\p{Lu}+", "ΛΘΓΔα", Some((0, 8)));
mat!(uni_case_upper_nocase_flag, r"(?i)\p{Lu}+", "ΛΘΓΔα", Some((0, 10)));
mat!(uni_case_upper_nocase, r"\p{L}+", "ΛΘΓΔα", Some((0, 10)));
mat!(uni_case_lower, r"\p{Ll}+", "ΛΘΓΔα", Some((8, 10)));

// Test the Unicode friendliness of Perl character classes.
mat!(uni_perl_w, r"\w+", "dδd", Some((0, 4)));
mat!(uni_perl_w_not, r"\w+", "⥡", None);
mat!(uni_perl_w_neg, r"\W+", "⥡", Some((0, 3)));
mat!(uni_perl_d, r"\d+", "1२३9", Some((0, 8)));
mat!(uni_perl_d_not, r"\d+", "Ⅱ", None);
mat!(uni_perl_d_neg, r"\D+", "Ⅱ", Some((0, 3)));
mat!(uni_perl_s, r"\s+", " ", Some((0, 3)));
mat!(uni_perl_s_not, r"\s+", "☃", None);
mat!(uni_perl_s_neg, r"\S+", "☃", Some((0, 3)));

// And do the same for word boundaries.
mat!(uni_boundary_none, r"\d\b", "6δ", None);
mat!(uni_boundary_ogham, r"\d\b", "6 ", Some((0, 1)));
mat!(uni_not_boundary_none, r"\d\B", "6δ", Some((0, 1)));
mat!(uni_not_boundary_ogham, r"\d\B", "6 ", None);

// Test general categories.
//
// We should test more, but there's a lot. Write a script to generate more of
// these tests.
mat!(uni_class_gencat_cased_letter,
     r"\p{Cased_Letter}", "Ａ", Some((0, 3)));
mat!(uni_class_gencat_close_punctuation,
     r"\p{Close_Punctuation}", "❯", Some((0, 3)));
mat!(uni_class_gencat_connector_punctuation,
     r"\p{Connector_Punctuation}", "⁀", Some((0, 3)));
mat!(uni_class_gencat_control,
     r"\p{Control}", "\u{9f}", Some((0, 2)));
mat!(uni_class_gencat_currency_symbol,
     r"\p{Currency_Symbol}", "￡", Some((0, 3)));
mat!(uni_class_gencat_dash_punctuation,
     r"\p{Dash_Punctuation}", "〰", Some((0, 3)));
mat!(uni_class_gencat_decimal_numer,
     r"\p{Decimal_Number}", "𑓙", Some((0, 4)));
mat!(uni_class_gencat_enclosing_mark,
     r"\p{Enclosing_Mark}", "\u{A672}", Some((0, 3)));
mat!(uni_class_gencat_final_punctuation,
     r"\p{Final_Punctuation}", "⸡", Some((0, 3)));
mat!(uni_class_gencat_format,
     r"\p{Format}", "\u{E007F}", Some((0, 4)));
mat!(uni_class_gencat_initial_punctuation,
     r"\p{Initial_Punctuation}", "⸜", Some((0, 3)));
mat!(uni_class_gencat_letter,
     r"\p{Letter}", "Έ", Some((0, 2)));
mat!(uni_class_gencat_letter_number,
     r"\p{Letter_Number}", "ↂ", Some((0, 3)));
mat!(uni_class_gencat_line_separator,
     r"\p{Line_Separator}", "\u{2028}", Some((0, 3)));
mat!(uni_class_gencat_lowercase_letter,
     r"\p{Lowercase_Letter}", "ϛ", Some((0, 2)));
mat!(uni_class_gencat_mark,
     r"\p{Mark}", "\u{E01EF}", Some((0, 4)));
mat!(uni_class_gencat_math,
     r"\p{Math}", "⋿", Some((0, 3)));
mat!(uni_class_gencat_modifier_letter,
     r"\p{Modifier_Letter}", "𖭃", Some((0, 4)));
mat!(uni_class_gencat_modifier_symbol,
     r"\p{Modifier_Symbol}", "🏿", Some((0, 4)));
mat!(uni_class_gencat_nonspacing_mark,
     r"\p{Nonspacing_Mark}", "\u{1E94A}", Some((0, 4)));
mat!(uni_class_gencat_number,
     r"\p{Number}", "⓿", Some((0, 3)));
mat!(uni_class_gencat_open_punctuation,
     r"\p{Open_Punctuation}", "｟", Some((0, 3)));
mat!(uni_class_gencat_other,
     r"\p{Other}", "\u{bc9}", Some((0, 3)));
mat!(uni_class_gencat_other_letter,
     r"\p{Other_Letter}", "ꓷ", Some((0, 3)));
mat!(uni_class_gencat_other_number,
     r"\p{Other_Number}", "㉏", Some((0, 3)));
mat!(uni_class_gencat_other_punctuation,
     r"\p{Other_Punctuation}", "𞥞", Some((0, 4)));
mat!(uni_class_gencat_other_symbol,
     r"\p{Other_Symbol}", "⅌", Some((0, 3)));
mat!(uni_class_gencat_paragraph_separator,
     r"\p{Paragraph_Separator}", "\u{2029}", Some((0, 3)));
mat!(uni_class_gencat_private_use,
     r"\p{Private_Use}", "\u{10FFFD}", Some((0, 4)));
mat!(uni_class_gencat_punctuation,
     r"\p{Punctuation}", "𑁍", Some((0, 4)));
mat!(uni_class_gencat_separator,
     r"\p{Separator}", "\u{3000}", Some((0, 3)));
mat!(uni_class_gencat_space_separator,
     r"\p{Space_Separator}", "\u{205F}", Some((0, 3)));
mat!(uni_class_gencat_spacing_mark,
     r"\p{Spacing_Mark}", "\u{16F7E}", Some((0, 4)));
mat!(uni_class_gencat_symbol,
     r"\p{Symbol}", "⯈", Some((0, 3)));
mat!(uni_class_gencat_titlecase_letter,
     r"\p{Titlecase_Letter}", "ῼ", Some((0, 3)));
mat!(uni_class_gencat_unassigned,
     r"\p{Unassigned}", "\u{10FFFF}", Some((0, 4)));
mat!(uni_class_gencat_uppercase_letter,
     r"\p{Uppercase_Letter}", "Ꝋ", Some((0, 3)));