Running examples in ‘rebus.unicode-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: Unicode
> ### Title: Unicode classes
> ### Aliases: ADDITIONAL_ARROWS AEGEAN_NUMBERS ALCHEMICAL_SYMBOLS
> ###   ALPHABETIC_PRESENTATION_FORMS ANCIENT_GREEK_MUSICAL_NOTATION
> ###   ANCIENT_GREEK_NUMBERS ANCIENT_SYMBOLS ARABIC ARABIC_EXTENDED_A
> ###   ARABIC_MATHEMATICAL_ALPHANUMERIC_SYMBOLS ARABIC_PRESENTATION_FORMS_A
> ###   ARABIC_PRESENTATION_FORMS_B ARABIC_SUPPLEMENT ARMENIAN
> ###   ARMENIAN_LIGATURES AVESTAN BALINESE BAMUN BAMUN_SUPPLEMENT BASSA_VAH
> ###   BATAK BENGALI_AND_ASSAMESE BLOCK_ELEMENTS BOPOMOFO BOPOMOFO_EXTENDED
> ###   BOX_DRAWING BRAHMI BRAILLE_PATTERNS BUGINESE BUHID
> ###   BYZANTINE_MUSICAL_SYMBOLS CARD_SUITS CARIAN CAUCASIAN_ALBANIAN CHAKMA
> ###   CHAM CHEROKEE CHESS_CHECKERS_DRAUGHTS CJK_COMPATIBILITY
> ###   CJK_COMPATIBILITY_FORMS CJK_COMPATIBILITY_IDEOGRAPHS
> ###   CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT
> ###   CJK_IDEOGRAPHIC_DESCRIPTION_CHARACTERS CJK_STROKES
> ###   CJK_SYMBOLS_AND_PUNCTUATION CJK_UNIFIED_IDEOGRAPHS
> ###   CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
> ###   CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D
> ###   COMBINING_DIACRITIC_EXTENDED COMBINING_DIACRITIC_MARKS
> ###   COMBINING_DIACRITIC_MARKS_FOR_SYMBOLS COMBINING_DIACRITIC_SUPPLEMENT
> ###   COMBINING_HALF_MARKS COMMON_INDIC_NUMBER_FORMS CONTROL_PICTURES
> ###   COPTIC COPTIC_EPACT_NUMBERS COUNTING_ROD_NUMERALS CUNEIFORM
> ###   CUNEIFORM_NUMBERS_AND_PUNCTUATION CURRENCY_SYMBOLS CYPRIOT_SYLLABARY
> ###   CYRILLIC CYRILLIC_EXTENDED_A CYRILLIC_EXTENDED_B CYRILLIC_SUPPLEMENT
> ###   DESERET DEVANAGARI DEVANAGARI_EXTENDED DINGBATS DOMINO_TILES DUPLOYAN
> ###   EGYPTIAN_HIEROGLYPHS ELBASAN EMOTICONS ENCLOSED_ALPHANUMERICS
> ###   ENCLOSED_ALPHANUMERIC_SUPPLEMENT ENCLOSED_CJK_LETTERS_AND_MONTHS
> ###   ENCLOSED_IDEOGRAPHIC_SUPPLEMENT ETHIOPIC ETHIOPIC_EXTENDED
> ###   ETHIOPIC_EXTENDED_A ETHIOPIC_SUPPLEMENT FLOORS_AND_CEILINGS
> ###   FULLWIDTH_ASCII_DIGITS FULLWIDTH_ASCII_PUNCTUATION
> ###   GENERAL_PUNCTUATION GEOMETRIC_SHAPES GEOMETRIC_SHAPES_EXTENDED
> ###   GEORGIAN GEORGIAN_SUPPLEMENT GLAGOLITIC GOTHIC GRANTHA
> ###   GREEK_AND_COPTIC GREEK_EXTENDED GUJARATI GURMUKHI
> ###   HALFWIDTH_AND_FULLWIDTH_FORMS HANGUL_COMPATIBILITY_JAMO HANGUL_JAMO
> ###   HANGUL_JAMO_EXTENDED_A HANGUL_JAMO_EXTENDED_B HANGUL_SYLLABLES
> ###   HANUNOO HEBREW HIRAGANA IMPERIAL_ARAMAIC INVISIBLE_OPERATORS
> ###   IPA_EXTENSIONS JAPANESE_CHESS JAVANESE KAITHI KANA_SUPPLEMENT KANBUN
> ###   KANGXI_RADICALS KANGXI_RADICALS_SUPPLEMENT KANNADA KATAKANA
> ###   KATAKANA_PHONETIC_EXTENSIONS KAYAH_LI KHAROSHTHI KHMER KHMER_SYMBOLS
> ###   KHOJKI KHUDAWADI LAO LATIN LATIN_1_PUNCTUATION LATIN_1_SUPPLEMENT
> ###   LATIN_EXTENDED_A LATIN_EXTENDED_ADDITIONAL LATIN_EXTENDED_B
> ###   LATIN_EXTENDED_C LATIN_EXTENDED_D LATIN_EXTENDED_E LATIN_LIGATURES
> ###   LEPCHA LETTERLIKE_SYMBOLS LIMBU LINEAR_A LINEAR_B_IDEOGRAMS
> ###   LINEAR_B_SYLLABARY LISU LYCIAN LYDIAN MAHAJANI MAHJONG_TILES
> ###   MALAYALAM MANDAIC MANICHAEAN MATHEMATICAL_ALPHANUMERIC_SYMBOLS
> ###   MATH_ARROWS MEETEI_MAYEK MEETEI_MAYEK_EXTENSIONS MENDE_KIKAKUI
> ###   MEROITIC_CURSIVE MEROITIC_HIEROGLYPHS MIAO
> ###   MISCELLANEOUS_MATHEMATICAL_SYMBOLS_A
> ###   MISCELLANEOUS_MATHEMATICAL_SYMBOLS_B
> ###   MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS MISCELLANEOUS_TECHNICAL MODI
> ###   MODIFIER_TONE_LETTERS MONGOLIAN MRO MUSICAL_SYMBOLS MYANMAR
> ###   MYANMAR_EXTENDED_A MYANMAR_EXTENDED_B NABATAEAN NEW_TAI_LUE NKO
> ###   NUMBER_FORMS OGHAM OLD_ITALIC OLD_NORTH_ARABIAN OLD_PERMIC
> ###   OLD_PERSIAN OLD_SOUTH_ARABIAN OLD_TURKIC OL_CHIKI
> ###   OPTICAL_CHARACTER_RECOGNITION ORIYA ORNAMENTAL_DINGBATS OSMANYA
> ###   PAHAWH_HMONG PAHLAVI_INSCRIPTIONAL PAHLAVI_PSALTER PALMYRENE
> ###   PAU_CIN_HAU PHAGS_PA PHAISTOS_DISC PHOENICIAN PHONETIC_EXTENSIONS
> ###   PHONETIC_EXTENSIONS_SUPPLEMENT PLAYING_CARDS PRIVATE_USE_AREA REJANG
> ###   RUMI_NUMERAL_SYMBOLS RUNIC SAMARITAN SAURASHTRA SHARADA SHAVIAN
> ###   SHORTHAND_FORMAT_CONTROLS SIDDHAM SINHALA SINHALA_ARCHAIC_NUMBERS
> ###   SMALL_FORM_VARIANTS SORA_SOMPENG SPACING_MODIFIER_LETTERS SPECIALS
> ###   SUNDANESE SUNDANESE_SUPPLEMENT SUPERSCRIPTS_AND_SUBSCRIPTS
> ###   SUPPLEMENTAL_ARROWS_A SUPPLEMENTAL_MATHEMATICAL_OPERATORS
> ###   SUPPLEMENTAL_PUNCTUATION SUPPLEMENTARY_PRIVATE_USE_AREA_A
> ###   SUPPLEMENTARY_PRIVATE_USE_AREA_B SYLOTI_NAGRI SYRIAC TAGALOG TAGBANWA
> ###   TAGS TAI_LE TAI_THAM TAI_VIET TAI_XUAN_JING_SYMBOLS TAKRI TAMIL
> ###   TELUGU THAANA THAI TIBETAN TIFINAGH TIRHUTA TRANSPORT_AND_MAP_SYMBOLS
> ###   UGARITIC UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS
> ###   UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS_EXTENDED Unicode VAI
> ###   VARIATION_SELECTORS VARIATION_SELECTORS_SUPPLEMENT VEDIC_EXTENSIONS
> ###   VERTICAL_FORMS WARANG_CITI YIJING_HEXAGRAM_SYMBOLS
> ###   YIJING_MONO_DI_AND_TRIGRAMS YI_RADICALS YI_SYLLABLES
> ###   additional_arrows aegean_numbers alchemical_symbols
> ###   alphabetic_presentation_forms ancient_greek_musical_notation
> ###   ancient_greek_numbers ancient_symbols arabic arabic_extended_a
> ###   arabic_mathematical_alphanumeric_symbols arabic_presentation_forms_a
> ###   arabic_presentation_forms_b arabic_supplement armenian
> ###   armenian_ligatures avestan balinese bamun bamun_supplement bassa_vah
> ###   batak bengali_and_assamese block_elements bopomofo bopomofo_extended
> ###   box_drawing brahmi braille_patterns buginese buhid
> ###   byzantine_musical_symbols card_suits carian caucasian_albanian chakma
> ###   cham cherokee chess_checkers_draughts cjk_compatibility
> ###   cjk_compatibility_forms cjk_compatibility_ideographs
> ###   cjk_compatibility_ideographs_supplement
> ###   cjk_ideographic_description_characters cjk_strokes
> ###   cjk_symbols_and_punctuation cjk_unified_ideographs
> ###   cjk_unified_ideographs_extension_a cjk_unified_ideographs_extension_b
> ###   cjk_unified_ideographs_extension_c cjk_unified_ideographs_extension_d
> ###   combining_diacritic_extended combining_diacritic_marks
> ###   combining_diacritic_marks_for_symbols combining_diacritic_supplement
> ###   combining_half_marks common_indic_number_forms control_pictures
> ###   coptic coptic_epact_numbers counting_rod_numerals cuneiform
> ###   cuneiform_numbers_and_punctuation currency_symbols cypriot_syllabary
> ###   cyrillic cyrillic_extended_a cyrillic_extended_b cyrillic_supplement
> ###   deseret devanagari devanagari_extended dingbats domino_tiles duployan
> ###   egyptian_hieroglyphs elbasan emoticons
> ###   enclosed_alphanumeric_supplement enclosed_alphanumerics
> ###   enclosed_cjk_letters_and_months enclosed_ideographic_supplement
> ###   ethiopic ethiopic_extended ethiopic_extended_a ethiopic_supplement
> ###   floors_and_ceilings fullwidth_ascii_digits
> ###   fullwidth_ascii_punctuation general_punctuation geometric_shapes
> ###   geometric_shapes_extended georgian georgian_supplement glagolitic
> ###   gothic grantha greek_and_coptic greek_extended gujarati gurmukhi
> ###   halfwidth_and_fullwidth_forms hangul_compatibility_jamo hangul_jamo
> ###   hangul_jamo_extended_a hangul_jamo_extended_b hangul_syllables
> ###   hanunoo hebrew hiragana imperial_aramaic invisible_operators
> ###   ipa_extensions japanese_chess javanese kaithi kana_supplement kanbun
> ###   kangxi_radicals kangxi_radicals_supplement kannada katakana
> ###   katakana_phonetic_extensions kayah_li kharoshthi khmer khmer_symbols
> ###   khojki khudawadi lao latin latin_1_punctuation latin_1_supplement
> ###   latin_extended_a latin_extended_additional latin_extended_b
> ###   latin_extended_c latin_extended_d latin_extended_e latin_ligatures
> ###   lepcha letterlike_symbols limbu linear_a linear_b_ideograms
> ###   linear_b_syllabary lisu lycian lydian mahajani mahjong_tiles
> ###   malayalam mandaic manichaean math_arrows
> ###   mathematical_alphanumeric_symbols meetei_mayek
> ###   meetei_mayek_extensions mende_kikakui meroitic_cursive
> ###   meroitic_hieroglyphs miao miscellaneous_mathematical_symbols_a
> ###   miscellaneous_mathematical_symbols_b
> ###   miscellaneous_symbols_and_pictographs miscellaneous_technical modi
> ###   modifier_tone_letters mongolian mro musical_symbols myanmar
> ###   myanmar_extended_a myanmar_extended_b nabataean new_tai_lue nko
> ###   number_forms ogham ol_chiki old_italic old_north_arabian old_permic
> ###   old_persian old_south_arabian old_turkic
> ###   optical_character_recognition oriya ornamental_dingbats osmanya
> ###   pahawh_hmong pahlavi_inscriptional pahlavi_psalter palmyrene
> ###   pau_cin_hau phags_pa phaistos_disc phoenician phonetic_extensions
> ###   phonetic_extensions_supplement playing_cards private_use_area rejang
> ###   rumi_numeral_symbols runic samaritan saurashtra sharada shavian
> ###   shorthand_format_controls siddham sinhala sinhala_archaic_numbers
> ###   small_form_variants sora_sompeng spacing_modifier_letters specials
> ###   sundanese sundanese_supplement superscripts_and_subscripts
> ###   supplemental_arrows_a supplemental_mathematical_operators
> ###   supplemental_punctuation supplementary_private_use_area_a
> ###   supplementary_private_use_area_b syloti_nagri syriac tagalog tagbanwa
> ###   tags tai_le tai_tham tai_viet tai_xuan_jing_symbols takri tamil
> ###   telugu thaana thai tibetan tifinagh tirhuta transport_and_map_symbols
> ###   ugaritic unified_canadian_aboriginal_syllabics
> ###   unified_canadian_aboriginal_syllabics_extended vai
> ###   variation_selectors variation_selectors_supplement vedic_extensions
> ###   vertical_forms warang_citi yi_radicals yi_syllables
> ###   yijing_hexagram_symbols yijing_mono_di_and_trigrams
> ### Keywords: datasets
> 
> ### ** Examples
> 
> # Classes
> latin()
<regex> [ -]
> greek_and_coptic()
<regex> [Ͱ-Ͽ]
> cyrillic()
<regex> [Ѐ-ӿ]
> arabic()
<regex> [؀-ۿ]
> 
> # With repetition
> hebrew(3, 6)
<regex> [֐-׿]{3,6}
> hiragana(1, Inf)
<regex> [぀-ゟ]+
> katakana(0, Inf)
<regex> [゠-ヿ]*
> 
> # Without a class wrapper
> cjk_unified_ideographs(char_class = FALSE)
<regex> 一-鿌
> 
> # Constants
> ARMENIAN
<regex> ԰-֏
> LINEAR_B_IDEOGRAMS
<regex> 𐂀-𐃿
> DUPLOYAN
<regex> 𛰀-𛲟
> OSMANYA
<regex> 𐒀-𐒯
> 
> ## Not run: 
> ##D # All the Unicode characer classes
> ##D # Not run, since it generates lots of output
> ##D setdiff(
> ##D   ls("package:rebus.unicode", pattern = lower()), 
> ##D   ls(
> ##D     "package:rebus.unicode", 
> ##D     pattern = START %R% case_insensitive(or("up", "ugc", "unicode")))
> ##D )
> ## End(Not run)
> 
> # Usage
> pythag <- "\u03b1^2 + \u03b2^2 = \u03b3^2"
> stringi::stri_extract_all_regex(pythag, greek_and_coptic())
Error in loadNamespace(x) : there is no package called ‘stringi’
Calls: loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
Execution halted