Create markup with predefined symbols

<h3>Original:</h3>
sum_(i=1)^n i^3=((n(n+1))/2)^2
<h3>Resultado:</h3>
'sum_(i=1)^n i^3=((n(n+1))/2)^2'
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=AM_HTMLorMML"></script>

/* Este é o código obtido em http://strapdownjs.com/v/0.2/strapdown.js e minificado */
(function(){function e(e){this.tokens=[],this.tokens.links={},this.options=e||l.defaults,this.rules=o.normal,this.options.gfm&&(this.options.tables?this.rules=o.tables:this.rules=o.gfm)}function t(e,t){if(this.options=t||l.defaults,this.links=e,this.rules=h.normal,!this.links)throw new Error("Tokens array requires a 'links' property.");this.options.gfm?this.options.breaks?this.rules=h.breaks:this.rules=h.gfm:this.options.pedantic&&(this.rules=h.pedantic)}function n(e){this.tokens=[],this.token=null,this.options=e||l.defaults}function s(e,t){return e.replace(t?/&/g:/&(?!#?\w+;)/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;").replace(/'/g,"&#39;")}function r(e,t){return e=e.source,t=t||"",function n(s,r){return s?(r=r.source||r,r=r.replace(/(^|[^\[])\^/g,"$1"),e=e.replace(s,r),n):new RegExp(e,t)}}function i(){}function a(e){for(var t,n,s=1;s<arguments.length;s++){t=arguments[s];for(n in t)Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n])}return e}function l(t,s){try{return s&&(s=a({},l.defaults,s)),n.parse(e.lex(t,s),s)}catch(r){if(r.message+="\nPlease report this to https://github.com/chjj/marked.",(s||l.defaults).silent)return"An error occured:\n"+r.message;throw r}}var o={newline:/^\n+/,code:/^( {4}[^\n]+\n*)+/,fences:i,hr:/^( *[-*_]){3,} *(?:\n+|$)/,heading:/^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,nptable:i,lheading:/^([^\n]+)\n *(=|-){3,} *\n*/,blockquote:/^( *>[^\n]+(\n[^\n]+)*\n*)+/,list:/^( *)(bull) [\s\S]+?(?:hr|\n{2,}(?! )(?!bull )\n*|\s*$)/,html:/^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,def:/^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,table:i,paragraph:/^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,text:/^[^\n]+/};o.bullet=/(?:[*+-]|\d+\.)/,o.item=/^( *)(bull) [^\n]*(?:\n(?!bull )[^\n]*)*/,o.item=r(o.item,"gm")(/bull/g,o.bullet)(),o.list=r(o.list)(/bull/g,o.bullet)("hr",/\n+(?=(?: *[-*_]){3,} *(?:\n+|$))/)(),o._tag="(?!(?:a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)\b)\w+(?!:/|@)\b",o.html=r(o.html)("comment",/<!--[\s\S]*?-->/)("closed",/<(tag)[\s\S]+?<\/>/)("closing",/<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)(/tag/g,o._tag)(),o.paragraph=r(o.paragraph)("hr",o.hr)("heading",o.heading)("lheading",o.lheading)("blockquote",o.blockquote)("tag","<"+o._tag)("def",o.def)(),o.normal=a({},o),o.gfm=a({},o.normal,{fences:/^ *('{3,}|~{3,}) *(\w+)? *\n([\s\S]+?)\s* *(?:\n+|$)/,paragraph:/^/}),o.gfm.paragraph=r(o.paragraph)("(?!","(?!"+o.gfm.fences.source.replace("\1","\2")+"|")(),o.tables=a({},o.gfm,{nptable:/^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,table:/^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/}),e.rules=o,e.lex=function(t,n){var s=new e(n);return s.lex(t)},e.prototype.lex=function(e){return e=e.replace(/\r\n|\r/g,"\n").replace(/\t/g,"    ").replace(/\u00a0/g," ").replace(/\u2424/g,"\n"),this.token(e,!0)},e.prototype.token=function(e,t){for(var n,s,r,i,a,l,h,u,c,e=e.replace(/^ +$/gm,"");e;)if((r=this.rules.newline.exec(e))&&(e=e.substring(r[0].length),r[0].length>1&&this.tokens.push({type:"space"})),r=this.rules.code.exec(e))e=e.substring(r[0].length),r=r[0].replace(/^ {4}/gm,""),this.tokens.push({type:"code",text:this.options.pedantic?r:r.replace(/\n+$/,"")});else if(r=this.rules.fences.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"code",lang:r[2],text:r[3]});else if(r=this.rules.heading.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"heading",depth:r[1].length,text:r[2]});else if(t&&(r=this.rules.nptable.exec(e))){for(e=e.substring(r[0].length),l={type:"table",header:r[1].replace(/^ *| *\| *$/g,"").split(/ *\| */),align:r[2].replace(/^ *|\| *$/g,"").split(/ *\| */),cells:r[3].replace(/\n$/,"").split("\n")},u=0;u<l.align.length;u++)/^ *-+: *$/.test(l.align[u])?l.align[u]="right":/^ *:-+: *$/.test(l.align[u])?l.align[u]="center":/^ *:-+ *$/.test(l.align[u])?l.align[u]="left":l.align[u]=null;for(u=0;u<l.cells.length;u++)l.cells[u]=l.cells[u].split(/ *\| */);this.tokens.push(l)}else if(r=this.rules.lheading.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"heading",depth:"="===r[2]?1:2,text:r[1]});else if(r=this.rules.hr.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"hr"});else if(r=this.rules.blockquote.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"blockquote_start"}),r=r[0].replace(/^ *> ?/gm,""),this.token(r,t),this.tokens.push({type:"blockquote_end"});else if(r=this.rules.list.exec(e)){for(e=e.substring(r[0].length),this.tokens.push({type:"list_start",ordered:isFinite(r[2])}),r=r[0].match(this.rules.item),this.options.smartLists&&(i=o.bullet.exec(r[0])[0]),n=!1,c=r.length,u=0;c>u;u++)l=r[u],h=l.length,l=l.replace(/^ *([*+-]|\d+\.) +/,""),~l.indexOf("\n ")&&(h-=l.length,l=this.options.pedantic?l.replace(/^ {1,4}/gm,""):l.replace(new RegExp("^ {1,"+h+"}","gm"),"")),this.options.smartLists&&u!==c-1&&(a=o.bullet.exec(r[u+1])[0],i===a||"."===i[1]&&"."===a[1]||(e=r.slice(u+1).join("\n")+e,u=c-1)),s=n||/\n\n(?!\s*$)/.test(l),u!==c-1&&(n="\n"===l[l.length-1],s||(s=n)),this.tokens.push({type:s?"loose_item_start":"list_item_start"}),this.token(l,!1),this.tokens.push({type:"list_item_end"});this.tokens.push({type:"list_end"})}else if(r=this.rules.html.exec(e))e=e.substring(r[0].length),this.tokens.push({type:this.options.sanitize?"paragraph":"html",pre:"pre"===r[1],text:r[0]});else if(t&&(r=this.rules.def.exec(e)))e=e.substring(r[0].length),this.tokens.links[r[1].toLowerCase()]={href:r[2],title:r[3]};else if(t&&(r=this.rules.table.exec(e))){for(e=e.substring(r[0].length),l={type:"table",header:r[1].replace(/^ *| *\| *$/g,"").split(/ *\| */),align:r[2].replace(/^ *|\| *$/g,"").split(/ *\| */),cells:r[3].replace(/(?: *\| *)?\n$/,"").split("\n")},u=0;u<l.align.length;u++)/^ *-+: *$/.test(l.align[u])?l.align[u]="right":/^ *:-+: *$/.test(l.align[u])?l.align[u]="center":/^ *:-+ *$/.test(l.align[u])?l.align[u]="left":l.align[u]=null;for(u=0;u<l.cells.length;u++)l.cells[u]=l.cells[u].replace(/^ *\| *| *\| *$/g,"").split(/ *\| */);this.tokens.push(l)}else if(t&&(r=this.rules.paragraph.exec(e)))e=e.substring(r[0].length),this.tokens.push({type:"paragraph",text:"\n"===r[1][r[1].length-1]?r[1].slice(0,-1):r[1]});else if(r=this.rules.text.exec(e))e=e.substring(r[0].length),this.tokens.push({type:"text",text:r[0]});else if(e)throw new Error("Infinite loop on byte: "+e.charCodeAt(0));return this.tokens};var h={escape:/^\([\'*{}\[\]()#+\-.!_>])/,autolink:/^<([^ >]+(@|:\/)[^ >]+)>/,url:i,tag:/^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,link:/^!?\[(inside)\]\(href\)/,reflink:/^!?\[(inside)\]\s*\[([^\]]*)\]/,nolink:/^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,strong:/^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,em:/^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,code:/^('+)\s*([\s\S]*?[^'])\s*(?!')/,br:/^ {2,}\n(?!\s*$)/,del:i,text:/^[\s\S]+?(?=[\<!\[_*']| {2,}\n|$)/};h._inside=/(?:\[[^\]]*\]|[^\]]|\](?=[^\[]*\]))*/,h._href=/\s*<?([^\s]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/,h.link=r(h.link)("inside",h._inside)("href",h._href)(),h.reflink=r(h.reflink)("inside",h._inside)(),h.normal=a({},h),h.pedantic=a({},h.normal,{strong:/^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,em:/^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/}),h.gfm=a({},h.normal,{escape:r(h.escape)("])","~|])")(),url:/^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,del:/^~~(?=\S)([\s\S]*?\S)~~/,text:r(h.text)("]|","~]|")("|","|https?://|")()}),h.breaks=a({},h.gfm,{br:r(h.br)("{2,}","*")(),text:r(h.gfm.text)("{2,}","*")()}),t.rules=h,t.output=function(e,n,s){var r=new t(n,s);return r.output(e)},t.prototype.output=function(e){for(var t,n,r,i,a="";e;)if(i=this.rules.escape.exec(e))e=e.substring(i[0].length),a+=i[1];else if(i=this.rules.autolink.exec(e))e=e.substring(i[0].length),"@"===i[2]?(n=":"===i[1][6]?this.mangle(i[1].substring(7)):this.mangle(i[1]),r=this.mangle("mailto:")+n):(n=s(i[1]),r=n),a+='<a href="'+r+'">'+n+"</a>";else if(i=this.rules.url.exec(e))e=e.substring(i[0].length),n=s(i[1]),r=n,a+='<a href="'+r+'">'+n+"</a>";else if(i=this.rules.tag.exec(e))e=e.substring(i[0].length),a+=this.options.sanitize?s(i[0]):i[0];else if(i=this.rules.link.exec(e))e=e.substring(i[0].length),a+=this.outputLink(i,{href:i[2],title:i[3]});else if((i=this.rules.reflink.exec(e))||(i=this.rules.nolink.exec(e))){if(e=e.substring(i[0].length),t=(i[2]||i[1]).replace(/\s+/g," "),t=this.links[t.toLowerCase()],!t||!t.href){a+=i[0][0],e=i[0].substring(1)+e;continue}a+=this.outputLink(i,t)}else if(i=this.rules.strong.exec(e))e=e.substring(i[0].length),a+="<strong>"+this.output(i[2]||i[1])+"</strong>";else if(i=this.rules.em.exec(e))e=e.substring(i[0].length),a+="<em>"+this.output(i[2]||i[1])+"</em>";else if(i=this.rules.code.exec(e))e=e.substring(i[0].length),a+="<code>"+s(i[2],!0)+"</code>";else if(i=this.rules.br.exec(e))e=e.substring(i[0].length),a+="<br>";else if(i=this.rules.del.exec(e))e=e.substring(i[0].length),a+="<del>"+this.output(i[1])+"</del>";else if(i=this.rules.text.exec(e))e=e.substring(i[0].length),a+=s(i[0]);else if(e)throw new Error("Infinite loop on byte: "+e.charCodeAt(0));return a},t.prototype.outputLink=function(e,t){return"!"!==e[0][0]?'<a href="'+s(t.href)+'"'+(t.title?' title="'+s(t.title)+'"':"")+">"+this.output(e[1])+"</a>":'<img src="'+s(t.href)+'" alt="'+s(e[1])+'"'+(t.title?' title="'+s(t.title)+'"':"")+">"},t.prototype.mangle=function(e){for(var t,n="",s=e.length,r=0;s>r;r++)t=e.charCodeAt(r),Math.random()>.5&&(t="x"+t.toString(16)),n+="&#"+t+";";return n},n.parse=function(e,t){var s=new n(t);return s.parse(e)},n.prototype.parse=function(e){this.inline=new t(e.links,this.options),this.tokens=e.reverse();for(var n="";this.next();)n+=this.tok();return n},n.prototype.next=function(){return this.token=this.tokens.pop()},n.prototype.peek=function(){return this.tokens[this.tokens.length-1]||0},n.prototype.parseText=function(){for(var e=this.token.text;"text"===this.peek().type;)e+="\n"+this.next().text;return this.inline.output(e)},n.prototype.tok=function(){switch(this.token.type){case"space":return"";case"hr":return"<hr>\n";case"heading":return"<h"+this.token.depth+">"+this.inline.output(this.token.text)+"</h"+this.token.depth+">\n";case"code":if(this.options.highlight){var e=this.options.highlight(this.token.text,this.token.lang);null!=e&&e!==this.token.text&&(this.token.escaped=!0,this.token.text=e)}return this.token.escaped||(this.token.text=s(this.token.text,!0)),"<pre><code"+(this.token.lang?' class="'+this.options.langPrefix+this.token.lang+'"':"")+">"+this.token.text+"</code></pre>\n";case"table":var t,n,r,i,a,l="";for(l+="<thead>\n<tr>\n",n=0;n<this.token.header.length;n++)t=this.inline.output(this.token.header[n]),l+=this.token.align[n]?'<th align="'+this.token.align[n]+'">'+t+"</th>\n":"<th>"+t+"</th>\n";for(l+="</tr>\n</thead>\n",l+="<tbody>\n",n=0;n<this.token.cells.length;n++){for(r=this.token.cells[n],l+="<tr>\n",a=0;a<r.length;a++)i=this.inline.output(r[a]),l+=this.token.align[a]?'<td align="'+this.token.align[a]+'">'+i+"</td>\n":"<td>"+i+"</td>\n";l+="</tr>\n"}return l+="</tbody>\n","<table>\n"+l+"</table>\n";case"blockquote_start":for(var l="";"blockquote_end"!==this.next().type;)l+=this.tok();return"<blockquote>\n"+l+"</blockquote>\n";case"list_start":for(var o=this.token.ordered?"ol":"ul",l="";"list_end"!==this.next().type;)l+=this.tok();return"<"+o+">\n"+l+"</"+o+">\n";case"list_item_start":for(var l="";"list_item_end"!==this.next().type;)l+="text"===this.token.type?this.parseText():this.tok();return"<li>"+l+"</li>\n";case"loose_item_start":for(var l="";"list_item_end"!==this.next().type;)l+=this.tok();return"<li>"+l+"</li>\n";case"html":return this.token.pre||this.options.pedantic?this.token.text:this.inline.output(this.token.text);case"paragraph":return"<p>"+this.inline.output(this.token.text)+"</p>\n";case"text":return"<p>"+this.parseText()+"</p>\n"}},i.exec=i,l.options=l.setOptions=function(e){return a(l.defaults,e),l},l.defaults={gfm:!0,tables:!0,breaks:!1,pedantic:!1,sanitize:!1,smartLists:!1,silent:!1,highlight:null,langPrefix:"lang-"},l.Parser=n,l.parser=n.parse,l.Lexer=e,l.lexer=e.lex,l.InlineLexer=t,l.inlineLexer=t.output,l.parse=l,"object"==typeof exports?module.exports=l:"function"==typeof define&&define.amd?define(function(){return l}):this.marked=l}).call(function(){return this||("undefined"!=typeof window?window:global)}()),window.PR_SHOULD_USE_CONTINUATION=!0;var prettyPrintOne,prettyPrint;!function(){function e(e){function t(e){var t=e.charCodeAt(0);if(92!==t)return t;var n=e.charAt(1);return t=c[n],t?t:n>="0"&&"7">=n?parseInt(e.substring(1),8):"u"===n||"x"===n?parseInt(e.substring(2),16):e.charCodeAt(1)}function n(e){if(32>e)return(16>e?"\x0":"\x")+e.toString(16);var t=String.fromCharCode(e);return"\"===t||"-"===t||"]"===t||"^"===t?"\"+t:t}function s(e){var s=e.substring(1,e.length-1).match(new RegExp("\\u[0-9A-Fa-f]{4}|\\x[0-9A-Fa-f]{2}|\\[0-3][0-7]{0,2}|\\[0-7]{1,2}|\\[\s\S]|-|[^-\\]","g")),r=[],i="^"===s[0],a=["["];i&&a.push("^");for(var l=i?1:0,o=s.length;o>l;++l){var h=s[l];if(/\[bdsw]/i.test(h))a.push(h);else{var u,c=t(h);o>l+2&&"-"===s[l+1]?(u=t(s[l+2]),l+=2):u=c,r.push([c,u]),65>u||c>122||(65>u||c>90||r.push([32|Math.max(65,c),32|Math.min(u,90)]),97>u||c>122||r.push([-33&Math.max(97,c),-33&Math.min(u,122)]))}}r.sort(function(e,t){return e[0]-t[0]||t[1]-e[1]});for(var p=[],g=[],l=0;l<r.length;++l){var d=r[l];d[0]<=g[1]+1?g[1]=Math.max(g[1],d[1]):p.push(g=d)}for(var l=0;l<p.length;++l){var d=p[l];a.push(n(d[0])),d[1]>d[0]&&(d[1]+1>d[0]&&a.push("-"),a.push(n(d[1])))}return a.push("]"),a.join("")}function r(e){for(var t=e.source.match(new RegExp("(?:\[(?:[^\x5C\x5D]|\\[\s\S])*\]|\\u[A-Fa-f0-9]{4}|\\x[A-Fa-f0-9]{2}|\\[0-9]+|\\[^ux0-9]|\(\?[:!=]|[\(\)\^]|[^\x5B\x5C\(\)\^]+)","g")),r=t.length,l=[],o=0,h=0;r>o;++o){var u=t[o];if("("===u)++h;else if("\"===u.charAt(0)){var c=+u.substring(1);c&&(h>=c?l[c]=-1:t[o]=n(c))}}for(var o=1;o<l.length;++o)-1===l[o]&&(l[o]=++i);for(var o=0,h=0;r>o;++o){var u=t[o];if("("===u)++h,l[h]||(t[o]="(?:");else if("\"===u.charAt(0)){var c=+u.substring(1);c&&h>=c&&(t[o]="\"+l[c])}}for(var o=0;r>o;++o)"^"===t[o]&&"^"!==t[o+1]&&(t[o]="");if(e.ignoreCase&&a)for(var o=0;r>o;++o){var u=t[o],p=u.charAt(0);u.length>=2&&"["===p?t[o]=s(u):"\"!==p&&(t[o]=u.replace(/[a-zA-Z]/g,function(e){var t=e.charCodeAt(0);return"["+String.fromCharCode(-33&t,32|t)+"]"}))}return t.join("")}for(var i=0,a=!1,l=!1,o=0,h=e.length;h>o;++o){var u=e[o];if(u.ignoreCase)l=!0;else 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t===e?void 0:t}function r(t,s){var r,i={};!function(){for(var n=t.concat(s),a=[],l={},o=0,h=n.length;h>o;++o){var u=n[o],c=u[3];if(c)for(var p=c.length;--p>=0;)i[c.charAt(p)]=u;var g=u[1],d=""+g;l.hasOwnProperty(d)||(a.push(g),l[d]=null)}a.push(/[
Este é o demo em HTML:
<xmp>Olá, _**está** tudo_ bem?</xmp>
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Este é o demo em HTML:
<xmp>Olá, _**está** tudo_ bem?</xmp>
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<h3>Original:</h3>
sum_(i=1)^n i^3=((n(n+1))/2)^2
<h3>Resultado:</h3>
'sum_(i=1)^n i^3=((n(n+1))/2)^2'
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=AM_HTMLorMML"></script>