utf2ascii

#!/bin/sh
help() { cat <<'/help'
Convert look-alike characters into ASCII, outputs to standard output without -i
Usage: utf2ascii [OPTIONS] [FILE]
  -h, --help                       View this help
  -i[SUFFIX], --in-place[=SUFFIX]  Edit files in place (save backups w/ SUFFIX)
  --perl                           Use perl instead of sed (may work better)
  -V, --version                    View this script's version info

If you're looking for phonetic transliterations, try one of:
    iconv -f utf-8 -t ascii//translit
    uconv -x "::NFD; [:Nonspacing Mark:] > ; ::NFC;"
    uconv -x "::Latin; ::Latin-ASCII;"
    perl -MText::Unidecode -pe 'use open qw(:std :utf8); $_ = unidecode($_)'

Part of misc-scripts: https://github.com/adamhotep/misc-scripts
utf2ascii 1.0.20240806.0 copyright © 2005+ by Adam Katz <@adamhotep>, GPLv3+
/help
}

# parse arguments looking for -h/--help, --in-place, --perl, and -V/--version
# as needed to provide extras. Perl doesn't know --in-place, so it becomes -i.
mark=reset
for arg in "$@"; do
  if [ "$mark" = reset ]; then mark=''; set --; fi
    case "$mark$arg" in
      ( -- )			mark=--mark-$$; set -- "$@" -- ;;
      ( -h | --help )		help; exit ;;
      ( --in-place )		set -- "$@" -i ;;
      ( --in-place=?* )		set -- "$@" -i"${arg#--in-place=}" ;;
      ( --perl )		sed() { perl -p -CAS -Mutf8 "$@"; } ;;
      ( -V | --version )	help |tail -n2; exit ;;
      ( * )			set -- "$@" "$arg" ;;
  esac
done

# Unlike most code, this file is best edited in a NON-fixed-width font
# as that would make the ligatures and other wider characters easier to read.
# E.g. vim always forces fixed width, making many symbols indistinguishable.
#
# see also https://www.unicode.org/Public/security/8.0.0/confusables.txt
# and      https://stackoverflow.com/q/48825983/519360
#
# Sampling includes (but is not limited to)
# * ISO 8859-1 (Latin-1 Supplement, unicode U+0080 to U+00FF)
# * Latin Extended-A & -B, IPA Extensions (unicode U+0100 - U+02AF)
# * Greek and Coptic, Cyrillic, Armenian (unicode U+0370 - U+058F)
# * Georgian (U+10A0 to U+10FF)
# * Cherokee, CA Aboriginal (U+13A0 - U+167F)
# * Extensions: Cyrillic-C, Phonetic, Latin, Greek, Punct (U+1C80 - U+206F)
# * Currency Symbols (U+20A0 to U+20CF)
# * Letterlike Symbols (U+2100 to U+214F)
# * Arrows, Math Operators, Misc Technical, Control Pics (U+2190 to U+244A)
# * Glagolitic, Latin Ext-C, Coptic, Georgian Sup, Tifinagh (U+2C00 - U+2D7F)
# * CJK Compatibility units & ideographs (U+3300 - U+33FF)
# * Lisu,Vai,Cyrillic Ext-B,Bamum,Modifier Tone,Latin Ext-D (U+A4D0 - U+A7FF)
# * Alphabetic Presentation Forms (typset ligatures, U+FB00 - U+FB4F)
# * Halfwidth/Fullwidth forms (U+FF00 - U+FFEF)
# * Enclosed Alphanumerics & Dingbats (single character extraction only)
#
# While there are a few ligatures and non-letter mappings here, they are not as
# exhaustive as the letter mappings.

sed "$@" -e '

# DIGITS
s/[ØƟǾΘθϑϴѲѺ҈҉ӨӪᴓⲐⴱⵁⵙⵚᎾᏫꝊ㍘０⓪⓿]/0/g;
s/[ꛨ㍙㏠１①⑴⒈⓵❶➀➊]/1/g;
s/[ƻƧϨϩշՁՉՋջⳈⳉᒿꝛꝜꝝ㍚㏡２②⑵⒉⓶❷➁➋]/2/g;
s/[ʒƷƺǮǯȜȝЗзҘҙѮѯӞӟӠӡэՑᴈᴣᶔᶚ℥ⲜⲝⳄⳅⳌⳍვꜢꜣꝪꝫꞫ㍛㏢３③⑶⒊⓷❸➂➌]/3/g;
s/[ᏎꜬꜭꜮꜯ㍜㏣４④⑷⒋⓸❹➃➍]/4/g;
s/[ƼƽҔҕ㍝㏤５⑤⑸⒌⓹❺➄➎]/5/g;
s/[ỼⳒⳓ㍞㏥６⑥⑹⒍⓺❻➅➏]/6/g;
s/[ᲄ⁊ꚨ㍟㏦７⑦⑺⒎⓻❼➆➐]/7/g;
s/[Ȣȣᴕ㍠㏧８⑧⑻⒏⓼❽➇➑]/8/g;
s/[ԳⳊⳋꝮꝯꝰ㍡㏨９⑨⑼⒐⓽❾➈➒]/9/g;

# LETTERS
s/[ÀÁÂÃÄÅĀĂĄǍǞǠǺȀȂȦƛȺɅΆΑΔΛλϪϫАДдѦѧӐӒԮՃᲁᴀᴧḀẠẢẤẦẨẪẬẮẰẲẴẶἈἉἊἋἌἍἎἏᾈᾉᾊᾋᾌᾍᾎᾏᾸᾹᾺΆᾼ₳ⲀⴷⵠᎪᗅᗋᗗᗩ∧ꓥꓮꙘꙢꚀꛎＡ∆∧⋀ÅⒶ]/A/g;
s/[ªàáâãäåāăąǎǟǡǻȁȃȧɑʌʎάαаӑӓᶏᶐḁẚạảấầẩẫậắằẳẵặἀἁἂἃἄἅἆἇᾀᾁᾂᾃᾄᾅᾆᾇᾰᾱᾲᾳᾴᾶᾷὰάⱥⲁａ⍶⍺⒜ⓐ]/a/g;
s/[ßƁΒɃβϐБбВвՅᲀᴃḂḄḆẞ₿ⲂᏰᏴᗷᗹᙖᙗᙘꓐꜨꞖꞚꞛꞴꞵＢℬⒷ]/B/g;
s/[þƀƂƃƄƅɓɞʙϸϦϬϭЪЬъьҌҍѢѣᲆᲇᵬᵷᶀḃḅḇⰓⲃⴆⴑႦႱნსწხᏏᏸᏼᑾᑿᒀᒁᒂᖯꙎꙏｂ␢⒝ⓑ]/b/g;
s/[ÇĆĈĊČƇϹϚϾСҀҪḈ₡€₵ⲤⳞⵎⵛᏟᑕᑖᑡᑢᑣᑤᑥᑪᙅꓚꞒＣ∁⊂⊆⊊⊏⊑⋐⋢⋤ⅭↃↅℂ℃ℭⒸ]/C/g;
s/[¢çćĉċčƈɕͼςϛҫϲсєҁԍᲃᴄḉⲥⳟⴀᘳꞓｃ￠ⅽↄ⒞ⓒ]/c/g;
s/[ÐĎĐƉƊᴅᴆḊḌḎḐḒⲆᎠᑓᗞᗟᗠᗪᗫᗬᙃꓓꓷＤⅮↁⅅⒹ]/D/g;
s/[ðďđƋƌɖɗδȡԀԁԂԃԺժծձᵭᶁᶑḋḍḏḑḓẟ₫ⴋⴛმშძᑯᑰᑱᑺᑻᑼᑽꓒꝱꝺｄⅾⅆ⒟ⓓ]/d/g;
s/[ÈÉÊËĒĔĖĘĚƎƐȄȆȨƩƸƹɆΈΕΞΣέεԑξϵЀЁЄЕӖԐᴇᶓḔḖḘḚḜẸẺẼẾỀỂỄỆἐἑἒἓἔἕἘἙἚἛἜἝῈΈὲέ⁅ℰⲈⲉⲶⴹⴺⵉⵟᎬᏋꓰꓱꗋꜪꜫＥﾼ∃∄∈∉∊∋∌∍∑≋≡≢⋲⋳⋴⋵⋶⋷⋸⋹⋿ℇ⅀↋Ⓔ]/E/g;
s/[èéêëēĕėęěƏǝȅȇȩɵȼȻɇɐɘəɚɛɜɝеѐёҼҽҾҿӗӘәӚӛᶒᶕḕḗḙḛḝẹẻẽếềểễệｅ℈℮ℯⅇ⒠ⓔ]/e/g;
s/[ƑϜҒӺḞᖴꓝꓞꗓꛂꜰꝻꞘꟻＦ℉ℱℲⅎⒻ]/F/g;
s/[ſƒϝԲբᵮᶂḟẛẜẝ₣Ꝭꝭꞙｆ∫∮∱∲∳⒡ⓕ]/f/g;
s/[ĜĞĠĢƓǤǦǴԌḠ₲ႺᎶᏀᏩᏳꓖꞠＧⒼ]/G/g;
s/[ĝğġģƍƣǥǧǵɠɡɢʛցᶃḡⴂჟჭꞔꞡｇℊℽ⒢ⓖ]/g/g;
s/[ĤĦǶȞΉΗЊНнњҢҤӇӈӉӊԊԋԢԨԩңҥḢḤḦḨḪἨἩἪἫἬἭἮἯᾘᾙᾚᾛᾜᾝᾞᾟῊΉῌⱧⲎⲏⳭⴼᎻᕼꔠꜦꞪＨ∦∺ℋℌℍⒽ]/H/g;
s/[ĥħƕȟɦɧʜʩЋЂђћҺһԦԧիհḣḥḧḩḫẖⱨⴌⴙⴡႬჩႹᏂꚔꚕꛖꜧꞕｈℎℏ⒣ⓗ]/h/g;
s/[ÌÍÎÏĨĪĬĮİƖƗǏȈȊΊΐΙΪІЇӀӏḬḮỈỊἸἹἺἻἼἽἾἿῘῙῚΊⳔⵊⵏᏆꓲ꘡꜈꜉꜊꜋꜌꜍꜎꜏꜐ꞮＩｴￜ∣∥⌶⌈⌉⎛⎜⎞⎟⎡⎤⎥⎧⎪⎫⎮Ⅰ꠰꡶ℐℑⒾ]/I/g;
s/[¡ìíîïĩīĭįıǐȉȋɨɩɪΐίιϊіїլᶖḭḯỉịἰἱἲἳἴἵἶἷὶίῐῑῒΐῖῗⲓⳕᎥꙇꜟｉｪ⍳⍸ⅰ℩ℹⅈ⒤ⓘ]/i/g;
s/[ĴɈͿЈᴊᎫᒍᒎᒏᒘᒙᒚᒛꓙꞲＪ⌡⎠Ⓙ]/J/g;
s/[ĵǰȷɉɟɹɺʝϳјյⰬⱜｊⅉ⒥ⓙ]/j/g;
s/[ĶƘǨΚκϏϰЌЖКжӃӄкќѪҚқҜҝҞҟҠҡӁӂӜӝԞԟᴋḰḲḴ₭ⱩⲔⴽᏦꓗꓘꝀꝂꝄꞢꞰＫKⓀ]/K/g;
s/[ķĸƙǩᶄḱḳḵⱪⲕⳤꝁꝃꝅꞣｋ⒦ⓚ]/k/g;
s/[ĹĻĽĿŁԼւᴌḶḸḺḼⱠⱢⳐⳑⳖⳗᏞᒪᒫᒶᒷᒸᒹᒺꓡꚥꛚ꜑꜖ꝆꝈꞭＬ∟∠⊥Ⅼℒ⅂⅃Ⓛ]/L/g;
s/[ĺļľŀłƪƚȴɭɺʃʄʅʆʟᶅᶋᶘḷḹḻḽⱡⲒꙆꝲꞁꟾꝇꞋｌⅼℓ⒧ⓛ]/l/g;
s/[ΜϺМӍḾṀṂⰮⱮⲘᎷᗰᙏᙢꓟꙦＭﾶⅯℳⓂ]/M/g;
s/[ɱʍϻӎмᲅᴍᵯᶆḿṁṃ₥ⱞⲙⴅⴇⴊⴜთორღჶᘻꙧꝳｍ㎡㎥ⅿ⒨ⓜ]/m/g;
s/[ÑŃŅŇŊƝǸȠͶͷийΝИЙΠЍЛПҊӢӤԈԒԤՈᴎṄṆṈṊ₦ⲚⲠⵍꓠꚡꞐＮℕⓃ]/N/g;
s/[ñńņňʼnƞǹȵηπϗлпѝҋӣӥԉԓԥԯՈՊՌդήըղոռրᴒᴨᵰᶇṅṇṉṋἠἡἢἣἤἥἦἧᾐᾑᾒᾓᾔᾕᾖᾗῂῃῄῆῇὴήᴫⲛⲡⴄⴈⴖიꙥꝴꞃꞑꞥｎ∏∩⊓⋂⋒⒩ⓝ]/n/g;
s/[ÒÓÔÕÖƆŌŎŐƠǑȌȎȪȬȮȰΌΟΦΩΏϽϿОФЮӦԾՓՕṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢὈὉὊὋὌὍῸΌὨὩὪὫὬὭὮὯᾨᾩᾪᾫᾬᾭᾮᾯῺΏῼⱭⱰⲞⳲⵔႣᎤꓛꓳꙨꙪꚚꜾꝌꝹＯΩ℧Ⓞ]/O/g;
s/[òóôõöø°ºōŏőơǒǿȍȏȫȭȯȱɔʘͻͽοσόϙϬϭоѳѻӧөӫօᲂᲈ᳃ᴏᴐᴑᶗṍṏṑṓọỏốồổỗộớờởỡợὀὁὂὃὄὅὸόⱺⲑⲟⳳⴰᘯᘵꙩꙫꚛꜿꝋꝍｏ∅∘∝≎⊕⊖⊗⊘⊙⊚⊛⊜⊝⊡⋄⌀⌑⌮⌼⌽⌾⍜⍟⍤⍥⍬⎉⎊⎋⎏⎐⎑⎒⎔⏣ℴ⒪ⓞ]/o/g;
s/[¶ÞƤǷΡϷРҎԖՔᴘᴩṔṖῬ⁋Ᵽ₱₽ⲢⳀⳁⳎⳢ⳨ႲႼᎮᎵᏈᏢᑬᑭᑮᑶᑷᑸᑹᕈᕉᖘꓑꚰꛞꛫꝐꝒꝔꝤꝦꝨꟼＰ℘ℙ⅌Ⓟ]/P/g;
s/[ƥƿɸρφϱϼрҏԗթքᵱᵽᶈṕṗῤῥⲣⳣⴒꝑꝓꝕꝥꝩꝧｐ⍴⒫ⓟ]/p/g;
s/[ɊϘǪǬƢϕфԚⲪⵕႭႳꝖꝘꝾꞬＱℚ℺]Ⓠ/Q/g;
s/[ɋԛǫǭգզⲫꝗꝙꝿｑ⒬ⓠ]/q/g;
s/[ŔŖŘƦȐȒɌЯяԆᴙᴚṘṚṜṞⱤᎡᏒᖆᖇꓣꓤꝚꞦＲℛℜℝ℟Ⓡ]/R/g;
s/[ŕŗřȑȓɼɽɾɍʀʁгґғӆӷѓԻՐՒᴦᵲᵳᶉṙṛṝṟⳏꜥꝼꞅꜤꝵꞧꝶꞄｒ⒭ⓡ]/r/g;
s/[§ŚŜŞŠȘЅՏṠṢṤṦṨ₷ⱾႽᎦᏕᏚꓢꚂꚃꝸꞨＳⓈ]/S/g;
s/[śŝşšƨșȿʂϧѕᵴᶊṡṣṥṧṩꜱꞩｓ⒮ⓢ]/s/g;
s/[ŢŤŦƬƮȚȾͲͳΓΤЃГТҬӶԎᴛṪṬṮṰ₮₸ⲦⴶᎢꓔꔋꚌꚐꞀꞆＴ∓⊤⊺⍑⍡⏉Ⓣ]/T/g;
s/[ţťŧƫƭǂțȶȽɫɬɻʇʈͰͱτϮϯтҭԏԵԷեէᵵᵻᵼṫṭṯṱẗ†‡ⱦⲧⵐⵜᎿᏐꚍꚑꝉꝷꞎꞇｔｫｬｲｵｾﾄﾅ∔∤∻⊦⒯ⓣ]/t/g;
s/[ÙÚÛÜŨŪŬŮŰƯƱǓǕǗǙǛȔȖɄЦԱԿՄՍՎկմևṲṴṶṸṺỤỦỨỪỬỮỰⳘⵡႮᏌᑌᑗᑘᑧꓴꙠꚳꞞＵ∐⋃⋓Ⓤ]/U/g;
s/[ùúûüũūŭůűưǔǖǘǚǜȕȗʉʊʮʯμυϋΰύцчսնվᴜᵾᶙṳṵṷṹṻụủứừửữựⳙⴎⴑᘮᘴꙡꞟｕ⒰ⓤ]/u/g;
s/[ƲѴѶṼṾⱯⴸᏉᏙᏤᐯᐺᐻꓦꓯＶ∀∇⊻⋁ⅤℤℨⓋ]/V/g;
s/[∨ɣɤνѵѷᴠᵿṽṿὐὑὒὓὔὕὖὗὺύῠῡῢΰῦῧⰜⱱⱴｖ⋎√∨ⅴ⒱ⓥ]/v/g;
s/[ŴƜΨϢϣШЩԜẀẂẄẆẈ₩ⱲⲰⳂᎳᏔᗯᙎᙔᙡꙌꚆꚖꝞꝠꞶꟽꟿＷ￦Ⓦ]/W/g;
s/[ŵɯɰɷψωώϖϣшщѼѽѾѿԝպѡѱաᴡᴪẁẃẅẇẉẘὠὡὢὣὤὥὦὧὼώᾠᾡᾢᾣᾤᾥᾦᾧῲῳῴῶῷⱳⲱⳃⴍⴓᘺꙍꚇꚗꝟꝡꞷꟺｗ⍦⍵⍹⒲ⓦ]/w/g;
s/[ΧХҲӼӾẊẌ╳Ⲭⴳⴴⴵⵅⵋⵝ᙭ꞳＸⅩⓍ]/X/g;
s/[×χϗхѫҳӝӽӿᶍẋẍⲭⴟｘⅹ⒳ⓧ]/x/g;
s/[¥ÝŲŶŸƔƳȲɎʏΎΥΫϒϓϔϞϤЎЏУЧҮҶҸӋӮӰӲӴѰҰẎỲỴỶỸỾὙὛὝὟῨῩῪΎⲨⲮⵖႡႯႷႸჄᎩᎽꚎꚒꚵꞍＹｿ￥⑂ℽ⅄Ⓨ]/Y/g;
s/[ýÿųŷƴȳɥɏγϟϥуўџүұҵҷҹӌӯӱӳӵᶌẏẙỳỵỷỹỿⲩⲯⴁⴗⴘⴞⴤꚏꚓｙｯｼﾂ⒴ⓨ]/y/g;
s/[ŹŻŽȤΖζƵẐẒẔⱫⱿⲌᏃꓜꙀꙂꚧꛉＺℤℨⓏ]/Z/g;
s/[źżžȥɀʐƶᴢʑʒʓʫᴢᵶᶎẑẓẕⱬⲍⴭჍꙁꙃｚ⒵ⓩ]/z/g;

# LETTER-DRIVEN MULTI-CHARACTER MAPS
s/Ꜳ/AA/g;
s/ꜳ/aa/g;
s:℀:a/c:g;
s/[ÆǢǼӔᴁ]/AE/g;
s/[æǣǽӕᴂ]/ae/g;
s/㏂/am/g;
s:㏟:A/m:g;
s/Ꜵ/AO/g;
s/ꜵ/ao/g;
s:[℁⅍]:a/s:g;
s/[Ꜷ㍳]/AU/g;
s/ꜷ/au/g;
s/[ꜸꜺ]/AV/g;
s/[ꜹꜻ]/av/g;
s/Ꜽ/AY/g;
s/ꜽ/ay/g;
s/㍴/bar/g;
s/[ЫыӸӹꙐꙑ]/bl/g;
s/㏃/Bq/g;
s/㎈/cal/g;
s/㏄/cc/g;
s/㏅/cd/g;
s/₠/CE/g;
s:㏆:C/kg:g;
s/℄/CL/g;
s/[㎝㎠㎤]/cm/g;
s/㏇/Co./g;
s:℅:c/o:g;
s:℆:c/u:g;
s/㏈/dB/g;
s/ȸ/db/g;
s/㍲/da/g;
s/㎗/dl/g;
s/㍷/dm/g;
s/[DŽDŽDZ]/DZ/g;
s/[DžDz]/Dz/g;
s/[dždz]/dz/g;
s/fi/fi/g;
s/ff/ff/g;
s/ffi/ffi/g;
s/fl/fl/g;
s/ffl/ffl/g;
s/㎙/fm/g;
s/ſt/ft/g;
s/㏿/gal/g;
s/㎇/GB/g;
s/㎓/GHz/g;
s/㎬/GPA/g;
s/㏉/Gy/g;
s/㏊/ha/g;
s/㏋/HP/g;
s/㍱/hPa/g;
s/㎐/Hz/g;
s/[ꙖꙜ]/IA/g;
s/[ꙗꙝ]/ia/g;
s/[Ⅱǁ꠱꡷]/II/g;
s/ⅱ/ii/g;
s/[ⅢⲼⲽ꠲]/III/g;
s/ⅲ/iii/g;
s/IJ/IJ/g;
s/ij/ij/g;
s/㏌/in/g;
s/㍺/IU/g;
s/Ⅳ/IV/g;
s/ⅳ/iv/g;
s/Ⅸ/IX/g;
s/ⅸ/ix/g;
s/㎄/kA/g;
s/㎅/KB/g;
s/㎉/kcal/g;
s/㎏/kg/g;
s/㎑/kHz/g;
s/㏍/KK/g;
s/㎘/kl/g;
s/㏎/KM/g;
s/[㎞㎢㎦]/km/g;
s/㏀/kO/g;
s/㎪/kPa/g;
s/㏏/kt/g;
s/㎸/kV/g;
s/㎾/kW/g;
s/℔/lb/g;
s/LJ/LJ/g;
s/Lj/Lj/g;
s/lj/lj/g;
s/Ỻ/LL/g;
s/㏐/lm/g;
s/㏑/ln/g;
s/㏒/log/g;
s/ʪ/ls/g;
s/㏓/lx/g;
s/ʫ/lz/g;
s/㎃/mA/g;
s/㎆/MB/g;
s/㏔/mb/g;
s/㎎/mg/g;
s/㎒/mHz/g;
s/㏕/mil/g;
s/㎖/Ml/g;
s/[㎜㎟㎣]/mm/g;
s/㏁/MO/g;
s/㏖/mol/g;
s/㎫/MPa/g;
s/㎳/ms/g;
s:[㎧㎨]:m/s:g;
s/㎹/MV/g;
s/㎷/mV/g;
s/㎿/MW/g;
s/㎽/mW/g;
s/㎁/nA/g;
s/㎋/nF/g;
s/NJ/NJ/g;
s/Nj/Nj/g;
s/nj/nj/g;
s/ŋ/ng/g;
s/㎚/nm/g;
s/№/No/g;
s/㎱/ns/g;
s/㎵/nV/g;
s/㎻/nW/g;
s/⳪/oc/g;
s/Œ/OE/g;
s/œ/oe/g;
s/[ꙬꚘꝎ]/OO/g;
s/[ꙭꚙꝏ]/oo/g;
s/㍵/oV/g;
s/Ѹ/Oy/g;
s/ѹ/oy/g;
s/㎩/Pa/g;
s/㎀/pA/g;
s/㍶/pc/g;
s/㎊/pF/g;
s/㏗/pH/g;
s/㏘/pm/g;
s/㏙/PPM/g;
s/㏚/PR/g;
s/㎰/ps/g;
s/₧/Pts/g;
s/㎴/pV/g;
s/㎺/pW/g;
s/ȹ/qp/g;
s/㎭/rad/g;
s:[㎮㎯]:rad/s:g;
s/Ԙ/RE/g;
s/ⴠ/ru/g;
s/[Ԕ℞]/Rx/g;
s/ԕ/rx/g;
s/㏛/sr/g;
s/㏜/Sv/g;
s/st/st/g;
s/℡/Tel/g;
s/ᵺ/th/g;
s/㎔/THz/g;
s/ʦ/ts/g;
s/[ỻ₶]/tt/g;
s/ꜩ/tz/g;
s/㎂/uA/g;
s/ᵫ/ue/g;
s/㎌/uF/g;
s/㎍/ug/g;
s/㎕/ul/g;
s/㎛/um/g;
s/տ/un/g;
s/㎲/us/g;
s/㎶/uV/g;
s/㎼/uW/g;
s:㏞:V/m:g;
s/Ⅵ/VI/g;
s/ⅵ/vi/g;
s/Ⅶ/VII/g;
s/ⅶ/vii/g;
s/Ⅷ/VIII/g;
s/ⅷ/viii/g;
s/㏝/Wb/g;
s/Ⅺ/XI/g;
s/ⅺ/xi/g;
s/Ⅻ/XII/g;
s/ⅻ/xii/g;

# Symbols typically parenthesized in ASCII
s/©/(C)/g;
s/℗/(P)/g;
s/®/(R)/g;
s/℠/(SM)/g;
s/™/(TM)/g;

# SPECIAL CHARACTERS (sorted by US keyboard position, includes multi-char)
s/[‵`‛︑｀]/\`/g;
s/[¬˜∼˜⁓῀]/~/g;
s/[ⵑᴉǃ︕！]/!/g;
s/‼/!!/g;
s/⁉/!?/g;
s/[Թꞗ＠]/@/g;
s/[♯ⵌ＃]/\#/g;
s/[£¤ᙚ＄]/\$/g;
s/[‰‱⁒％]/%/g;
s/[ˆ＾]/^/g;
s/[⅋＆]/\&/g;
s/[・·･᛫·⸱𐄁•‧∙⋅ᐧꞏ∗×※⁂⁎⁑⁕⁜＊]/*/g;
s/[（｟]/(/g;
s/[）｟]/)/g;
s/[¯‐−‒–‑‥⁃⁌⁍─━┄┅┈┉⁻₋Ⲻⲻ⋯ⵈꟷ－ｰ￢￣￭￮]/-/g;
s/[—―]/--/g;
s/[꓿꞊＝]/=/g;
s/[├┝┞┟┠┡┢┣┤┥┦┧┨┩┪┫┌┍┎┏┐┑┒┓└┕┖┗┘┙┚┛┬┭┮┯┰┱┲┳┴┵┶┷┸┹┺┻┼┽┾┿╀╁╂╃╄╅╆╇╈╉╊╋＋]/+/g;
s/＿/_/g;
s:±:+/-:g;
s/[［｢]/[/g;
s/[］｣]/]/g;
s/｛/{/g;
s/｝/}/g;
s/＼/\\/g;
s/[¦ǀ│┃┆┇┊┋╎╏╽╿‖⁝⁞｜￤￨]/|/g;
s/[⁏ꓼ︔；]/;/g;
s/[⁚ꓽ꞉︓︙︰：∶]/:/g;
s/[´′‘’‚᾽᾿῏´῾ꞌ︐𐩐＇]/\047/g;
s/[¨„“”″‴‶‷᳓῍῎῝῞‟⁗＂]/"/g;
s/[¸‚ꓹ，､]/,/g;
s/[‹＜]/</g;
s/«/<</g;
s/[․꘎٠۰⸼ꓸ．｡]/./g;
s/[‥ꓺ]/../g;
s/…/.../g;
s/[›＞]/>/g;
s/»/>>/g;
s:[÷Ⳇⳇ⁄／]:/:g;
s/[¿␦⸮؟ʔɁॽᎮɂƾ︖？]/?/g;
s/⁇/??/g;
s/[⁈‽]/?!/g;
s/[   ]/ /g;
s/ /  /g;
# soft hyphen (&shy;) is non-printing and might not be visible here
s/­//g;

# effective smileys - deprecated in favor of interpreting as lowercase y
#s/[ｯｼﾂ]/:)/g;


# ARROWS
s/[←↚↜↞↤↩↫↼↽⇜⇠⇤⇷⇽￩]/<-/g;
s/[→↛↝↠↣↦↪↬⇀⇁⇝⇢⇥⇴⇸⇻⇾￫]/->/g;
s/[↔↭⇹⇼⇿]/<->/g;
s/[⇇⇍⇐⇚⇦]/<=/g;
s/[⇉⇏⇒⇛⇨⇰⇶]/=>/g;
s/[⇄⇆⇐⇎⇔]/<=>/g;

# MATH
s/⁰/^0/g;
s/¹/^1/g;
s/²/^2/g;
s/³/^3/g;
s/⁴/^4/g;
s/⁵/^5/g;
s/⁶/^6/g;
s/⁷/^7/g;
s/⁸/^8/g;
s/⁹/^9/g;

s/≠/!=/g;
s/≤/<=/g;
s/≥/>=/g;

# FRACTIONS
# If beginning the line or not preceded by a number, spell it out, otherwise
# put a space between that preceding number and the spelled out fraction.
# If GNU sed is missing, this should harmlessly do nothing (thus the
# frivolous parenthesis on the second expression). *Not* PCRE.
# Sorted by denominator
s:\([0-9]\)⅟:\1 1/:g;   s:\(⅟\):1/:g;
s:\([0-9]\)½:\1 1/2:g;  s:\(½\):1/2:g;
s:\([0-9]\)↉:\1 0/3:g;  s:\(↉\):0/3:g;
s:\([0-9]\)⅓:\1 1/3:g;  s:\(⅓\):1/3:g;
s:\([0-9]\)⅔:\1 2/3:g;  s:\(⅔\):2/3:g;
s:\([0-9]\)¼:\1 1/4:g;  s:\(¼\):1/4:g;
s:\([0-9]\)¾:\1 3/4:g;  s:\(¾\):3/4:g;
s:\([0-9]\)⅕:\1 1/5:g;  s:\(⅕\):1/5:g;
s:\([0-9]\)⅖:\1 2/5:g;  s:\(⅖\):2/5:g;
s:\([0-9]\)⅗:\1 3/5:g;  s:\(⅗\):3/5:g;
s:\([0-9]\)⅘:\1 4/5:g;  s:\(⅘\):4/5:g;
s:\([0-9]\)⅙:\1 1/6:g;  s:\(⅙\):1/6:g;
s:\([0-9]\)⅚:\1 5/6:g;  s:\(⅚\):5/6:g;
s:\([0-9]\)⅐:\1 1/7:g;  s:\(⅐\):1/7:g;
s:\([0-9]\)⅛:\1 1/8:g;  s:\(⅛\):1/8:g;
s:\([0-9]\)⅜:\1 3/8:g;  s:\(⅜\):3/8:g;
s:\([0-9]\)⅝:\1 5/8:g;  s:\(⅝\):5/8:g;
s:\([0-9]\)⅞:\1 7/8:g;  s:\(⅞\):7/8:g;
s:\([0-9]\)⅑:\1 1/9:g;  s:\(⅑\):1/9:g;
s:\([0-9]\)⅒:\1 1/10:g; s:\(⅒\):1/10:g;

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