Advanced extraction of HTML tags with Javascript Regex

function getTagFromHtmlText(html, tagFind, attrFind, attrValueFind, returnResult, all){
    html = html || '',
        reg = '';
    if(all === undefined){
      all = false;
    }
    html = html.replace(/<!--[\s\S]*?-->/g, ''); // remove comments

    if(attrFind === undefined || attrFind === false){
        reg = new RegExp('<'+tagFind+'\\b[^>]*(\\1)([^>]*/>|[^>]*>((?:(?:(?!<'+tagFind+'[^>]*>|<\/'+tagFind+'>)[\\s\\S])+|<'+tagFind+'[^>]*>([\\s\\S]*?)<\/'+tagFind+'>)*)<\/'+tagFind+'>)','gi'); 
    }else{
        reg = new RegExp('<'+tagFind+'\\b[^>]*'+attrFind+'=([\\\'"])?.*'+attrValueFind+'.*(\\1)([^>]*/>|[^>]*>((?:(?:(?!<'+tagFind+'[^>]*>|<\/'+tagFind+'>)[\\s\\S])+|<'+tagFind+'[^>]*>([\\s\\S]*?)<\/'+tagFind+'>)*)<\/'+tagFind+'>)','gi'); 
    }
    var matches = html.match(reg);
    if(matches === null){
        return false;
    }else{
        if(returnResult === true){
          if(all){
        		return matches;
        	}else{
        		return matches[0];
        	}
        }
        return true;
    }
    return false;
}