What about GeanyLua? And something like this

-- HTML-entity-to-symbol.lua (cross-platform)
-- 2023.06.01
--[[
EntitiesToUTF8(): see
  https://stackoverflow.com/questions/18694131/how-to-convert-utf8-byte-arrays-to-string-in-lua
]]

local aentities = {
["&Aacute;"] = "&#193;", ["&aacute;"] = "&#225;", ["&Abreve;"] = "&#258;", ["&abreve;"] = "&#259;", ["&ac;"] = "&#8766;", ["&acd;"] = "&#8767;", ["&Acirc;"] = "&#194;", ["&acirc;"] = "&#226;", ["&acute;"] = "&#180;", ["&AElig;"] = "&#198;",
["&aelig;"] = "&#230;", ["&Agrave;"] = "&#192;", ["&agrave;"] = "&#224;", ["&alefsym;"] = "&#8501;", ["&Alpha;"] = "&#913;", ["&alpha;"] = "&#945;", ["&Amacr;"] = "&#256;", ["&amacr;"] = "&#257;", ["&amp;"] = "&#38;", ["&and;"] = "&#8743;",
["&ang;"] = "&#8736;", ["&angmsd;"] = "&#8737;", ["&angrt;"] = "&#8735;", ["&angrtvb;"] = "&#8894;", ["&angsph;"] = "&#8738;", ["&Aogon;"] = "&#260;", ["&aogon;"] = "&#261;", ["&apid;"] = "&#8779;", ["&apos;"] = "&#39;", ["&approxeq;"] = "&#8778;",
["&Aring;"] = "&#197;", ["&aring;"] = "&#229;", ["&ast;"] = "&#42;", ["&asymp;"] = "&#8776;", ["&asympeq;"] = "&#8781;", ["&Atilde;"] = "&#195;", ["&atilde;"] = "&#227;", ["&Auml;"] = "&#196;", ["&auml;"] = "&#228;", ["&awconint;"] = "&#8755;",
["&backepsilon;"] = "&#1014;", ["&barvee;"] = "&#8893;", ["&bcong;"] = "&#8780;", ["&bdquo;"] = "&#8222;", ["&because;"] = "&#8757;", ["&bernou;"] = "&#8492;", ["&Beta;"] = "&#914;", ["&beta;"] = "&#946;", ["&beth;"] = "&#8502;", ["&between;"] = "&#8812;",
["&bowtie;"] = "&#8904;", ["&bprime;"] = "&#8245;", ["&brvbar;"] = "&#166;", ["&bsemi;"] = "&#8271;", ["&bsim;"] = "&#8765;", ["&bsime;"] = "&#8909;", ["&bsol;"] = "&#92;", ["&bull;"] = "&#8226;", ["&bump;"] = "&#8782;", ["&bumpe;"] = "&#8783;",
["&Cacute;"] = "&#262;", ["&cacute;"] = "&#263;", ["&cap;"] = "&#8745;", ["&Cap;"] = "&#8914;", ["&caret;"] = "&#8257;", ["&Ccaron;"] = "&#268;", ["&ccaron;"] = "&#269;", ["&Ccedil;"] = "&#199;", ["&ccedil;"] = "&#231;", ["&Ccirc;"] = "&#264;",
["&ccirc;"] = "&#265;", ["&Cconint;"] = "&#8752;", ["&Cdot;"] = "&#266;", ["&cdot;"] = "&#267;", ["&cedil;"] = "&#184;", ["&cent;"] = "&#162;", ["&Cfr;"] = "&#8493;", ["&check;"] = "&#10003;", ["&Chi;"] = "&#935;", ["&chi;"] = "&#967;",
["&circ;"] = "&#710;", ["&cire;"] = "&#8791;", ["&clubs;"] = "&#9827;", ["&colon;"] = "&#58;", ["&Colon;"] = "&#8759;", ["&colone;"] = "&#8788;", ["&comma;"] = "&#44;", ["&commat;"] = "&#64;", ["&comp;"] = "&#8705;", ["&compfn;"] = "&#8728;",
["&cong;"] = "&#8773;", ["&conint;"] = "&#8750;", ["&Conint;"] = "&#8751;", ["&Copf;"] = "&#8450;", ["&coprod;"] = "&#8720;", ["&copy;"] = "&#169;", ["&copysr;"] = "&#8471;", ["&crarr;"] = "&#8629;", ["&cross;"] = "&#10007;", ["&ctdot;"] = "&#8943;",
["&cudarrl;"] = "&#10552;", ["&cudarrr;"] = "&#10549;", ["&cuepr;"] = "&#8926;", ["&cuesc;"] = "&#8927;", ["&cularr;"] = "&#8630;", ["&cularrp;"] = "&#10557;", ["&cup;"] = "&#8746;", ["&Cup;"] = "&#8915;", ["&cupdot;"] = "&#8845;", ["&curarr;"] = "&#8631;",
["&curarrm;"] = "&#10556;", ["&curren;"] = "&#164;", ["&current;"] = "&#164;", ["&cuvee;"] = "&#8910;", ["&cuwed;"] = "&#8911;", ["&cwconint;"] = "&#8754;", ["&cwint;"] = "&#8753;", ["&dagger;"] = "&#8224;", ["&Dagger;"] = "&#8225;", ["&daleth;"] = "&#8504;",
["&darr;"] = "&#8595;", ["&Darr;"] = "&#8609;", ["&dArr;"] = "&#8659;", ["&dashv;"] = "&#8867;", ["&Dcaron;"] = "&#270;", ["&dcaron;"] = "&#271;", ["&DD;"] = "&#8517;", ["&dd;"] = "&#8518;", ["&ddarr;"] = "&#8650;", ["&DDotrahd;"] = "&#10513;",
["&deg;"] = "&#176;", ["&Delta;"] = "&#916;", ["&delta;"] = "&#948;", ["&dfisht;"] = "&#10623;", ["&dHar;"] = "&#10597;", ["&dharl;"] = "&#8643;", ["&dharr;"] = "&#8642;", ["&diamond;"] = "&#8900;", ["&diams;"] = "&#9830;", ["&disin;"] = "&#8946;",
["&divide;"] = "&#247;", ["&divonx;"] = "&#8903;", ["&dollar;"] = "&#36;", ["&DownArrowBar;"] = "&#10515;", ["&DownBreve;"] = "&#785;", ["&DownLeftRightVector;"] = "&#10576;", ["&DownLeftTeeVector;"] = "&#10590;", ["&DownLeftVectorBar;"] = "&#10582;", ["&DownRightTeeVector;"] = "&#10591;", ["&DownRightVectorBar;"] = "&#10583;",
["&Dstrok;"] = "&#272;", ["&dstrok;"] = "&#273;", ["&dtdot;"] = "&#8945;", ["&duarr;"] = "&#8693;", ["&duhar;"] = "&#10607;", ["&dzigrarr;"] = "&#10239;", ["&Eacute;"] = "&#201;", ["&eacute;"] = "&#233;", ["&Ecaron;"] = "&#282;", ["&ecaron;"] = "&#283;",
["&ecir;"] = "&#8790;", ["&Ecirc;"] = "&#202;", ["&ecirc;"] = "&#234;", ["&ecolon;"] = "&#8789;", ["&Edot;"] = "&#278;", ["&edot;"] = "&#279;", ["&eDot;"] = "&#8785;", ["&ee;"] = "&#8519;", ["&efDot;"] = "&#8786;", ["&Egrave;"] = "&#200;",
["&egrave;"] = "&#232;", ["&ell;"] = "&#8467;", ["&Emacr;"] = "&#274;", ["&emacr;"] = "&#275;", ["&empty;"] = "&#8709;", ["&emsp;"] = "&#8195;", ["&ENG;"] = "&#330;", ["&eng;"] = "&#331;", ["&ensp;"] = "&#8194;", ["&Eogon;"] = "&#280;",
["&eogon;"] = "&#281;", ["&epar;"] = "&#8917;", ["&Epsilon;"] = "&#917;", ["&epsilon;"] = "&#949;", ["&equals;"] = "&#61;", ["&equest;"] = "&#8799;", ["&equiv;"] = "&#8801;", ["&erarr;"] = "&#10609;", ["&erDot;"] = "&#8787;", ["&escr;"] = "&#8495;",
["&Escr;"] = "&#8496;", ["&esdot;"] = "&#8784;", ["&esim;"] = "&#8770;", ["&Eta;"] = "&#919;", ["&eta;"] = "&#951;", ["&ETH;"] = "&#208;", ["&eth;"] = "&#240;", ["&Euml;"] = "&#203;", ["&euml;"] = "&#235;", ["&euro;"] = "&#8364;",
["&excl;"] = "&#33;", ["&exist;"] = "&#8707;", ["&female;"] = "&#9792;", ["&flat;"] = "&#9837;", ["&fnof;"] = "&#402;", ["&forall;"] = "&#8704;", ["&fork;"] = "&#8916;", ["&frac12;"] = "&#189;", ["&frac13;"] = "&#8531;", ["&frac14;"] = "&#188;",
["&frac15;"] = "&#8533;", ["&frac16;"] = "&#8537;", ["&frac18;"] = "&#8539;", ["&frac23;"] = "&#8532;", ["&frac25;"] = "&#8534;", ["&frac34;"] = "&#190;", ["&frac35;"] = "&#8535;", ["&frac38;"] = "&#8540;", ["&frac45;"] = "&#8536;", ["&frac56;"] = "&#8538;",
["&frac58;"] = "&#8541;", ["&frac78;"] = "&#8542;", ["&frasl;"] = "&#8260;", ["&Fscr;"] = "&#8497;", ["&Gamma;"] = "&#915;", ["&gamma;"] = "&#947;", ["&Gammad;"] = "&#988;", ["&gammad;"] = "&#989;", ["&Gbreve;"] = "&#286;", ["&gbreve;"] = "&#287;",
["&Gcedil;"] = "&#290;", ["&Gcirc;"] = "&#284;", ["&gcirc;"] = "&#285;", ["&Gdot;"] = "&#288;", ["&gdot;"] = "&#289;", ["&ge;"] = "&#8805;", ["&gE;"] = "&#8807;", ["&gel;"] = "&#8923;", ["&Gg;"] = "&#8921;", ["&gimel;"] = "&#8503;",
["&gl;"] = "&#8823;", ["&gnE;"] = "&#8809;", ["&gnsim;"] = "&#8935;", ["&grave;"] = "&#96;", ["&gscr;"] = "&#8458;", ["&gsim;"] = "&#8819;", ["&gt;"] = "&#62;", ["&Gt;"] = "&#8811;", ["&gtdot;"] = "&#8919;", ["&gtrarr;"] = "&#10616;",
["&hamilt;"] = "&#8459;", ["&harr;"] = "&#8596;", ["&hArr;"] = "&#8660;", ["&harrcir;"] = "&#10568;", ["&harrw;"] = "&#8621;", ["&Hat;"] = "&#94;", ["&Hcirc;"] = "&#292;", ["&hcirc;"] = "&#293;", ["&hearts;"] = "&#9829;", ["&hellip;"] = "&#8230;",
["&hercon;"] = "&#8889;", ["&Hfr;"] = "&#8460;", ["&hoarr;"] = "&#8703;", ["&homtht;"] = "&#8763;", ["&Hopf;"] = "&#8461;", ["&horbar;"] = "&#8213;", ["&Hstrok;"] = "&#294;", ["&hstrok;"] = "&#295;", ["&hybull;"] = "&#8259;", ["&hyphen;"] = "&#8208;",
["&Iacute;"] = "&#205;", ["&iacute;"] = "&#237;", ["&Icirc;"] = "&#206;", ["&icirc;"] = "&#238;", ["&Idot;"] = "&#304;", ["&iexcl;"] = "&#161;", ["&Igrave;"] = "&#204;", ["&igrave;"] = "&#236;", ["&ii;"] = "&#8520;", ["&iiint;"] = "&#8749;",
["&iiota;"] = "&#8489;", ["&IJlig;"] = "&#306;", ["&ijlig;"] = "&#307;", ["&Imacr;"] = "&#298;", ["&imacr;"] = "&#299;", ["&image;"] = "&#8465;", ["&imath;"] = "&#305;", ["&imof;"] = "&#8887;", ["&incare;"] = "&#8453;", ["&infin;"] = "&#8734;",
["&int;"] = "&#8747;", ["&Int;"] = "&#8748;", ["&intcal;"] = "&#8890;", ["&Iogon;"] = "&#302;", ["&iogon;"] = "&#303;", ["&Iota;"] = "&#921;", ["&iota;"] = "&#953;", ["&iquest;"] = "&#191;", ["&Iscr;"] = "&#8464;", ["&isin;"] = "&#8712;",
["&isindot;"] = "&#8949;", ["&isinE;"] = "&#8953;", ["&isins;"] = "&#8948;", ["&isinsv;"] = "&#8947;", ["&Itilde;"] = "&#296;", ["&itilde;"] = "&#297;", ["&Iuml;"] = "&#207;", ["&iuml;"] = "&#239;", ["&Jcirc;"] = "&#308;", ["&jcirc;"] = "&#309;",
["&Kappa;"] = "&#922;", ["&kappa;"] = "&#954;", ["&Kcedil;"] = "&#310;", ["&kcedil;"] = "&#311;", ["&kgreen;"] = "&#312;", ["&lAarr;"] = "&#8666;", ["&Lacute;"] = "&#205;", ["&Lacute;"] = "&#313;", ["&lacute;"] = "&#314;", ["&Lambda;"] = "&#923;",
["&lambda;"] = "&#955;", ["&lang;"] = "&#9001;", ["&laquo;"] = "&#171;", ["&larr;"] = "&#8592;", ["&Larr;"] = "&#8606;", ["&lArr;"] = "&#8656;", ["&larrb;"] = "&#8676;", ["&larrbfs;"] = "&#10527;", ["&larrfs;"] = "&#10525;", ["&larrhk;"] = "&#8617;",
["&larrlp;"] = "&#8619;", ["&larrpl;"] = "&#10553;", ["&larrsim;"] = "&#10611;", ["&larrtl;"] = "&#8610;", ["&larrw;"] = "&#8604;", ["&latail;"] = "&#10521;", ["&lAtail;"] = "&#10523;", ["&lbarr;"] = "&#10508;", ["&lBarr;"] = "&#10510;", ["&lbbrk;"] = "&#10098;",
["&lbrace;"] = "&#123;", ["&lbrack;"] = "&#91;", ["&Lcaron;"] = "&#317;", ["&lcaron;"] = "&#318;", ["&Lcedil;"] = "&#315;", ["&lcedil;"] = "&#316;", ["&lceil;"] = "&#8968;", ["&Lcirc;"] = "&#206;", ["&lcub;"] = "&#123;", ["&ldca;"] = "&#10550;",
["&ldquo;"] = "&#8220;", ["&ldrdhar;"] = "&#10599;", ["&ldrushar;"] = "&#10571;", ["&ldsh;"] = "&#8626;", ["&le;"] = "&#8804;", ["&lE;"] = "&#8806;", ["&LeftDownTeeVector;"] = "&#10593;", ["&LeftDownVectorBar;"] = "&#10585;", ["&LeftRightVector;"] = "&#10574;", ["&LeftTeeVector;"] = "&#10586;",
["&LeftUpDownVector;"] = "&#10577;", ["&LeftUpTeeVector;"] = "&#10592;", ["&LeftUpVectorBar;"] = "&#10584;", ["&LeftVectorBar;"] = "&#10578;", ["&leg;"] = "&#8922;", ["&lfisht;"] = "&#10620;", ["&lfloor;"] = "&#8970;", ["&lg;"] = "&#8822;", ["&Lgrave;"] = "&#204;", ["&lHar;"] = "&#10594;",
["&lhard;"] = "&#8637;", ["&lharu;"] = "&#8636;", ["&lharul;"] = "&#10602;", ["&Ll;"] = "&#8920;", ["&llarr;"] = "&#8647;", ["&llhard;"] = "&#10603;", ["&Lmidot;"] = "&#319;", ["&lmidot;"] = "&#320;", ["&lnE;"] = "&#8808;", ["&lnsim;"] = "&#8934;",
["&loarr;"] = "&#8701;", ["&lowast;"] = "&#8727;", ["&lowbar;"] = "&#95;", ["&loz;"] = "&#9674;", ["&lpar;"] = "&#40;", ["&lrarr;"] = "&#8646;", ["&lrhar;"] = "&#8651;", ["&lrhard;"] = "&#10605;", ["&lrm;"] = "&#8206;", ["&lrtri;"] = "&#8895;",
["&lsaquo;"] = "&#8249;", ["&Lscr;"] = "&#8466;", ["&lsh;"] = "&#8624;", ["&lsim;"] = "&#8818;", ["&lsqb;"] = "&#91;", ["&lsquo;"] = "&#8216;", ["&Lstrok;"] = "&#321;", ["&lstrok;"] = "&#322;", ["&lt;"] = "&#60;", ["&Lt;"] = "&#8810;",
["&ltdot;"] = "&#8918;", ["&lthree;"] = "&#8907;", ["&ltimes;"] = "&#8905;", ["&ltlarr;"] = "&#10614;", ["&ltrie;"] = "&#8884;", ["&Luml;"] = "&#207;", ["&lurdshar;"] = "&#10570;", ["&luruhar;"] = "&#10598;", ["&macr;"] = "&#175;", ["&male;"] = "&#9794;",
["&malt;"] = "&#10016;", ["&Map;"] = "&#10501;", ["&mapstodown;"] = "&#8615;", ["&mapstoleft;"] = "&#8612;", ["&mapstoright;"] = "&#8614;", ["&mapstoup;"] = "&#8613;", ["&mdash;"] = "&#8212;", ["&mDDot;"] = "&#8762;", ["&mho;"] = "&#8487;", ["&micro;"] = "&#181;",
["&mid;"] = "&#8739;", ["&middot;"] = "&#183;", ["&minus;"] = "&#45;", ["&minus;"] = "&#8722;", ["&minusb;"] = "&#8863;", ["&minusd;"] = "&#8760;", ["&mnplus;"] = "&#8723;", ["&models;"] = "&#8871;", ["&Mscr;"] = "&#8499;", ["&Mu;"] = "&#924;",
["&mu;"] = "&#956;", ["&mumap;"] = "&#8888;", ["&nabla;"] = "&#8711;", ["&Nacute;"] = "&#323;", ["&nacute;"] = "&#324;", ["&nap;"] = "&#8777;", ["&napos;"] = "&#329;", ["&natural;"] = "&#9838;", ["&nbsp;"] = "&#160;", ["&Ncaron;"] = "&#327;",
["&ncaron;"] = "&#328;", ["&Ncedil;"] = "&#325;", ["&ncedil;"] = "&#326;", ["&ncong;"] = "&#8775;", ["&ndash;"] = "&#8211;", ["&ne;"] = "&#8800;", ["&nearhk;"] = "&#10532;", ["&nearr;"] = "&#8599;", ["&neArr;"] = "&#8663;", ["&nequiv;"] = "&#8802;",
["&nesear;"] = "&#10536;", ["&nexist;"] = "&#8708;", ["&nge;"] = "&#8817;", ["&ngsim;"] = "&#8821;", ["&ngt;"] = "&#8815;", ["&nharr;"] = "&#8622;", ["&nhArr;"] = "&#8654;", ["&ni;"] = "&#8715;", ["&ni;"] = "&#8727;", ["&nis;"] = "&#8956;",
["&nisd;"] = "&#8954;", ["&nlarr;"] = "&#8602;", ["&nlArr;"] = "&#8653;", ["&nldr;"] = "&#8229;", ["&nle;"] = "&#8816;", ["&nlsim;"] = "&#8820;", ["&nlt;"] = "&#8814;", ["&nltri;"] = "&#8938;", ["&nltrie;"] = "&#8940;", ["&nmid;"] = "&#8740;",
["&Nopf;"] = "&#8469;", ["&not;"] = "&#172;", ["&NotCupCap;"] = "&#8813;", ["&notin;"] = "&#8713;", ["&notinvb;"] = "&#8951;", ["&notinvc;"] = "&#8950;", ["&notni;"] = "&#8716;", ["&notnivb;"] = "&#8958;", ["&notnivc;"] = "&#8957;", ["&npar;"] = "&#8742;",
["&npr;"] = "&#8832;", ["&nprcue;"] = "&#8928;", ["&nrarr;"] = "&#8603;", ["&nrArr;"] = "&#8655;", ["&nrtri;"] = "&#8939;", ["&nrtrie;"] = "&#8941;", ["&nsc;"] = "&#8833;", ["&nsccue;"] = "&#8929;", ["&nsim;"] = "&#8769;", ["&nsime;"] = "&#8772;",
["&nsqsube;"] = "&#8930;", ["&nsqsupe;"] = "&#8931;", ["&nsub;"] = "&#8836;", ["&nsube;"] = "&#8840;", ["&nsup;"] = "&#8837;", ["&nsupe;"] = "&#8841;", ["&ntgl;"] = "&#8825;", ["&Ntilde;"] = "&#209;", ["&ntilde;"] = "&#241;", ["&ntlg;"] = "&#8824;",
["&Nu;"] = "&#925;", ["&nu;"] = "&#957;", ["&num;"] = "&#35;", ["&numero;"] = "&#8470;", ["&nvdash;"] = "&#8876;", ["&nvDash;"] = "&#8877;", ["&nVdash;"] = "&#8878;", ["&nVDash;"] = "&#8879;", ["&nvHarr;"] = "&#10500;", ["&nvlArr;"] = "&#10498;",
["&nvrArr;"] = "&#10499;", ["&nwarhk;"] = "&#10531;", ["&nwarr;"] = "&#8598;", ["&nwArr;"] = "&#8662;", ["&nwnear;"] = "&#10535;", ["&Oacute;"] = "&#211;", ["&oacute;"] = "&#243;", ["&oast;"] = "&#8859;", ["&ocir;"] = "&#8858;", ["&Ocirc;"] = "&#212;",
["&ocirc;"] = "&#244;", ["&odash;"] = "&#8861;", ["&Odblac;"] = "&#336;", ["&odblac;"] = "&#337;", ["&odot;"] = "&#8857;", ["&OElig;"] = "&#338;", ["&oelig;"] = "&#339;", ["&Ograve;"] = "&#210;", ["&ograve;"] = "&#242;", ["&olarr;"] = "&#8634;",
["&oline;"] = "&#8254;", ["&Omacr;"] = "&#332;", ["&omacr;"] = "&#333;", ["&Omega;"] = "&#937;", ["&omega;"] = "&#969;", ["&Omicron;"] = "&#927;", ["&omicron;"] = "&#959;", ["&ominus;"] = "&#8854;", ["&oplus;"] = "&#8853;", ["&or;"] = "&#8744;",
["&orarr;"] = "&#8635;", ["&ordf;"] = "&#170;", ["&ordm;"] = "&#186;", ["&origof;"] = "&#8886;", ["&oscr;"] = "&#8500;", ["&Oslash;"] = "&#216;", ["&oslash;"] = "&#248;", ["&osol;"] = "&#8856;", ["&Otilde;"] = "&#213;", ["&otilde;"] = "&#245;",
["&otimes;"] = "&#8855;", ["&Ouml;"] = "&#214;", ["&ouml;"] = "&#246;", ["&para;"] = "&#182;", ["&parallel;"] = "&#8741;", ["&part;"] = "&#8706;", ["&percnt;"] = "&#37;", ["&period;"] = "&#46;", ["&permil;"] = "&#137;", ["&permil;"] = "&#8240;",
["&perp;"] = "&#8869;", ["&pertenk;"] = "&#8241;", ["&Phi;"] = "&#934;", ["&phi;"] = "&#966;", ["&phone;"] = "&#9742;", ["&Pi;"] = "&#928;", ["&pi;"] = "&#960;", ["&piv;"] = "&#982;", ["&planck;"] = "&#8463;", ["&planckh;"] = "&#8462;",
["&plus;"] = "&#43;", ["&plusb;"] = "&#8862;", ["&plusdo;"] = "&#8724;", ["&plusmn;"] = "&#177;", ["&Popf;"] = "&#8473;", ["&pound;"] = "&#163;", ["&pr;"] = "&#8826;", ["&prcue;"] = "&#8828;", ["&prime;"] = "&#8242;", ["&Prime;"] = "&#8243;",
["&prnsim;"] = "&#8936;", ["&prod;"] = "&#8719;", ["&prop;"] = "&#8733;", ["&prsim;"] = "&#8830;", ["&prurel;"] = "&#8880;", ["&Psi;"] = "&#936;", ["&psi;"] = "&#968;", ["&Qopf;"] = "&#8474;", ["&qprime;"] = "&#8279;", ["&quest;"] = "&#63;",
["&quot;"] = "&#34;", ["&rAarr;"] = "&#8667;", ["&Racute;"] = "&#340;", ["&racute;"] = "&#341;", ["&radic;"] = "&#8730;", ["&rang;"] = "&#9002;", ["&raquo;"] = "&#187;", ["&rarr;"] = "&#8594;", ["&Rarr;"] = "&#8608;", ["&rArr;"] = "&#8658;",
["&rarrap;"] = "&#10613;", ["&rarrb;"] = "&#8677;", ["&rarrbfs;"] = "&#10528;", ["&rarrc;"] = "&#10547;", ["&rarrfs;"] = "&#10526;", ["&rarrhk;"] = "&#8618;", ["&rarrlp;"] = "&#8620;", ["&rarrpl;"] = "&#10565;", ["&rarrsim;"] = "&#10612;", ["&Rarrtl;"] = "&#10518;",
["&rarrtl;"] = "&#8611;", ["&rarrw;"] = "&#8605;", ["&ratail;"] = "&#10522;", ["&rAtail;"] = "&#10524;", ["&ratio;"] = "&#8758;", ["&rbarr;"] = "&#10509;", ["&rBarr;"] = "&#10511;", ["&RBarr;"] = "&#10512;", ["&rbbrk;"] = "&#10099;", ["&rbrace;"] = "&#125;",
["&rbrack;"] = "&#93;", ["&Rcaron;"] = "&#344;", ["&rcaron;"] = "&#345;", ["&Rcedil;"] = "&#342;", ["&rcedil;"] = "&#343;", ["&rceil;"] = "&#8969;", ["&rcub;"] = "&#125;", ["&rdca;"] = "&#10551;", ["&rdldhar;"] = "&#10601;", ["&rdquo;"] = "&#8221;",
["&rdsh;"] = "&#8627;", ["&real;"] = "&#8476;", ["&reg;"] = "&#174;", ["&rfisht;"] = "&#10621;", ["&rfloor;"] = "&#8971;", ["&rHar;"] = "&#10596;", ["&rhard;"] = "&#8641;", ["&rharu;"] = "&#8640;", ["&rharul;"] = "&#10604;", ["&Rho;"] = "&#929;",
["&rho;"] = "&#961;", ["&RightDownTeeVector;"] = "&#10589;", ["&RightDownVectorBar;"] = "&#10581;", ["&RightTeeVector;"] = "&#10587;", ["&RightUpDownVector;"] = "&#10575;", ["&RightUpTeeVector;"] = "&#10588;", ["&RightUpVectorBar;"] = "&#10580;", ["&RightVectorBar;"] = "&#10579;", ["&rlarr;"] = "&#8644;", ["&rlhar;"] = "&#8652;",
["&rlm;"] = "&#8207;", ["&roarr;"] = "&#8702;", ["&Ropf;"] = "&#8477;", ["&RoundImplies;"] = "&#10608;", ["&rpar;"] = "&#41;", ["&rrarr;"] = "&#8649;", ["&rsaquo;"] = "&#8250;", ["&Rscr;"] = "&#8475;", ["&rsh;"] = "&#8625;", ["&rsqb;"] = "&#93;",
["&rsquo;"] = "&#8217;", ["&rthree;"] = "&#8908;", ["&rtimes;"] = "&#8906;", ["&rtrie;"] = "&#8885;", ["&ruluhar;"] = "&#10600;", ["&rx;"] = "&#8478;", ["&Sacute;"] = "&#346;", ["&sacute;"] = "&#347;", ["&sbquo;"] = "&#8218;", ["&sc;"] = "&#8827;",
["&Scaron;"] = "&#352;", ["&scaron;"] = "&#353;", ["&sccue;"] = "&#8829;", ["&Scedil;"] = "&#350;", ["&scedil;"] = "&#351;", ["&Scirc;"] = "&#348;", ["&scirc;"] = "&#349;", ["&scnsim;"] = "&#8937;", ["&scsim;"] = "&#8831;", ["&sdot;"] = "&#8901;",
["&sdotb;"] = "&#8865;", ["&searhk;"] = "&#10533;", ["&searr;"] = "&#8600;", ["&seArr;"] = "&#8664;", ["&sect;"] = "&#167;", ["&semi;"] = "&#59;", ["&seswar;"] = "&#10537;", ["&setminus;"] = "&#8726;", ["&sext;"] = "&#10038;", ["&sharp;"] = "&#9839;",
["&shy;"] = "&#173;", ["&Sigma;"] = "&#931;", ["&sigma;"] = "&#963;", ["&sigmaf;"] = "&#962;", ["&sim;"] = "&#8764;", ["&sime;"] = "&#8771;", ["&simne;"] = "&#8774;", ["&simrarr;"] = "&#10610;", ["&sol;"] = "&#47;", ["&spades;"] = "&#9824;",
["&sqcap;"] = "&#8851;", ["&sqcup;"] = "&#8852;", ["&sqsub;"] = "&#8847;", ["&sqsube;"] = "&#8849;", ["&sqsup;"] = "&#8848;", ["&sqsupe;"] = "&#8850;", ["&Star;"] = "&#8902;", ["&star;"] = "&#9734;", ["&starf;"] = "&#9733;", ["&straightepsilon;"] = "&#1013;",
["&straightphi;"] = "&#981;", ["&sub;"] = "&#8834;", ["&Sub;"] = "&#8912;", ["&sube;"] = "&#8838;", ["&subne;"] = "&#8842;", ["&subrarr;"] = "&#10617;", ["&sum;"] = "&#8721;", ["&sung;"] = "&#9834;", ["&sup1;"] = "&#185;", ["&sup2;"] = "&#178;",
["&sup3;"] = "&#179;", ["&sup;"] = "&#8835;", ["&Sup;"] = "&#8913;", ["&supe;"] = "&#8839;", ["&suplarr;"] = "&#10619;", ["&supne;"] = "&#8843;", ["&swarhk;"] = "&#10534;", ["&swarr;"] = "&#8601;", ["&swArr;"] = "&#8665;", ["&swnwar;"] = "&#10538;",
["&szlig;"] = "&#223;", ["&Tau;"] = "&#932;", ["&tau;"] = "&#964;", ["&Tcaron;"] = "&#356;", ["&tcaron;"] = "&#357;", ["&Tcedil;"] = "&#354;", ["&tcedil;"] = "&#355;", ["&there4;"] = "&#8756;", ["&Theta;"] = "&#920;", ["&theta;"] = "&#952;",
["&thetasym;"] = "&#977;", ["&thinsp;"] = "&#8201;", ["&THORN;"] = "&#222;", ["&thorn;"] = "&#254;", ["&tilde;"] = "&#126;", ["&times;"] = "&#215;", ["&timesb;"] = "&#8864;", ["&top;"] = "&#8868;", ["&tprime;"] = "&#8244;", ["&trade;"] = "&#8482;",
["&trie;"] = "&#8796;", ["&Tstrok;"] = "&#358;", ["&tstrok;"] = "&#359;", ["&Uacute;"] = "&#218;", ["&uacute;"] = "&#250;", ["&uarr;"] = "&#8593;", ["&Uarr;"] = "&#8607;", ["&uArr;"] = "&#8657;", ["&Uarrocir;"] = "&#10569;", ["&Ubreve;"] = "&#364;",
["&ubreve;"] = "&#365;", ["&Ucirc;"] = "&#219;", ["&ucirc;"] = "&#251;", ["&udarr;"] = "&#8645;", ["&Udblac;"] = "&#368;", ["&udblac;"] = "&#369;", ["&udhar;"] = "&#10606;", ["&ufisht;"] = "&#10622;", ["&Ugrave;"] = "&#217;", ["&ugrave;"] = "&#249;",
["&uHar;"] = "&#10595;", ["&uharl;"] = "&#8639;", ["&uharr;"] = "&#8638;", ["&Umacr;"] = "&#362;", ["&umacr;"] = "&#363;", ["&uml;"] = "&#168;", ["&Uogon;"] = "&#370;", ["&uogon;"] = "&#371;", ["&UpArrowBar;"] = "&#10514;", ["&uplus;"] = "&#8846;",
["&upsih;"] = "&#978;", ["&Upsilon;"] = "&#933;", ["&upsilon;"] = "&#965;", ["&Uring;"] = "&#366;", ["&uring;"] = "&#367;", ["&utdot;"] = "&#8944;", ["&Utilde;"] = "&#360;", ["&utilde;"] = "&#361;", ["&uuarr;"] = "&#8648;", ["&Uuml;"] = "&#220;",
["&uuml;"] = "&#252;", ["&varkappa;"] = "&#1008;", ["&varr;"] = "&#8597;", ["&vArr;"] = "&#8661;", ["&varrho;"] = "&#1009;", ["&vdash;"] = "&#8866;", ["&vDash;"] = "&#8872;", ["&Vdash;"] = "&#8873;", ["&VDash;"] = "&#8875;", ["&veebar;"] = "&#8891;",
["&veeeq;"] = "&#8794;", ["&vellip;"] = "&#8942;", ["&verbar;"] = "&#124;", ["&vert;"] = "&#124;", ["&Vert;"] = "&#8214;", ["&VerticalSeparator;"] = "&#10072;", ["&vltri;"] = "&#8882;", ["&vrtri;"] = "&#8883;", ["&Vvdash;"] = "&#8874;", ["&Wcirc;"] = "&#372;",
["&wcirc;"] = "&#373;", ["&wedgeq;"] = "&#8793;", ["&weierp;"] = "&#8472;", ["&wreath;"] = "&#8768;", ["&xcap;"] = "&#8898;", ["&xcup;"] = "&#8899;", ["&xharr;"] = "&#10231;", ["&xhArr;"] = "&#10234;", ["&Xi;"] = "&#926;", ["&xi;"] = "&#958;",
["&xlarr;"] = "&#10229;", ["&xlArr;"] = "&#10232;", ["&xmap;"] = "&#10236;", ["&xnis;"] = "&#8955;", ["&xrarr;"] = "&#10230;", ["&xrArr;"] = "&#10233;", ["&xvee;"] = "&#8897;", ["&xwedge;"] = "&#8896;", ["&Yacute;"] = "&#221;", ["&yacute;"] = "&#253;",
["&Ycirc;"] = "&#374;", ["&ycirc;"] = "&#375;", ["&yen;"] = "&#165;", ["&yuml;"] = "&#255;", ["&Yuml;"] = "&#376;", ["&Zacute;"] = "&#377;", ["&zacute;"] = "&#378;", ["&Zcaron;"] = "&#381;", ["&zcaron;"] = "&#382;", ["&Zdot;"] = "&#379;",
["&zdot;"] = "&#380;", ["&Zeta;"] = "&#918;", ["&zeta;"] = "&#950;", ["&Zfr;"] = "&#8488;", ["&ziglarr;"] = "&#8668;", ["&zigrarr;"] = "&#8669;", ["&Zopf;"] = "&#8484;", ["&zwj;"] = "&#8205;", ["&zwnj;"] = "&#8204;"
}

local function EntitiesToUTF8(dec)
  -- https://stackoverflow.com/questions/18694131/how-to-convert-utf8-byte-arrays-to-string-in-lua
  local bytemarkers = {{0x7FF, 192}, {0xFFFF, 224}, {0x1FFFFF, 240}}
  if dec < 128 then return string.char(dec) end
  local cbs = {}
  for bytes, vals in ipairs(bytemarkers) do
    if dec <= vals[1] then
      for b = bytes + 1, 2, -1 do
        local mod = dec % 64
        dec = (dec - mod) / 64
        cbs[b] = string.char(128 + mod)
      end
      cbs[1] = string.char(vals[2] + dec)
      break
    end
  end
  return table.concat(cbs)
end

local sres, ssel, stmp

ssel = geany.selection()
if (ssel == nil) or (ssel == "") then
  geany.message("HTML entity to symbol", "Nothing is selected!")
  return
else
  if (string.sub(ssel, 1, 1) ~= "&") and (string.sub(ssel, -1, -1) ~= ";") then
    geany.message("HTML entity to symbol", "Selected text does not look like a HTML entity.")
    return
  end
end

if ssel == "&NewLine;" then
  geany.selection("\n")
  return
end

stmp = aentities[ssel]
if stmp == nil then stmp = ssel end
if string.sub(stmp, 1, 3) == "&#x" then
  sres = EntitiesToUTF8(tonumber(string.sub(stmp, 4, -2), 16))
else
  if string.sub(stmp, 1, 2) == "&#" then
    sres = EntitiesToUTF8(tonumber(string.sub(stmp, 3, -2), 10))
  else
    return
  end
end
if sres ~= ssel then geany.selection(sres) end

Documentation: see here, here /usr/share/doc/geany-plugin-lua or here C:\Program Files\Geany\share\doc\geany-plugins\geanylua.

Feature request HTML Characters plugin #1250

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