Weird highlighting of Matlab lexer

I'm using minted to highlight my code. I got a very weird highlighting, and it is different from the [demo page](https://pygments.org/demo/#try). Please forgive me if I ignore any issue related to this problem.

I use `pygmentize -f html -O full -O style=rainbow_dash -l Matlab -o test.html exp2_7.m` and get the following html file: 

![image](https://user-images.githubusercontent.com/20477228/86083877-fa61d900-bacd-11ea-94c1-d419cc47c3c4.png)

```html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
 "http://www.w3.org/TR/html4/strict.dtd">

<html>
<head>
 <title></title>
 <meta http-equiv="content-type" content="text/html; charset=utf-8">
 <style type="text/css">
/*
generated by Pygments <https://pygments.org/>
Copyright 2006-2019 by the Pygments team.
Licensed under the BSD license, see LICENSE for details.
*/
td.linenos { background-color: #f0f0f0; padding-right: 10px; }
span.lineno { background-color: #f0f0f0; padding: 0 5px 0 5px; }
pre { line-height: 125%; }
body .hll { background-color: #ffffcc }
body { background: #ffffff; color: #4d4d4d }
body .c { color: #0080ff; font-style: italic } /* Comment */
body .err { color: #ffffff; background-color: #cc0000 } /* Error */
body .k { color: #2c5dcd; font-weight: bold } /* Keyword */
body .o { color: #2c5dcd } /* Operator */
body .ch { color: #0080ff; font-style: italic } /* Comment.Hashbang */
body .cm { color: #0080ff; font-style: italic } /* Comment.Multiline */
body .cp { color: #0080ff } /* Comment.Preproc */
body .cpf { color: #0080ff; font-style: italic } /* Comment.PreprocFile */
body .c1 { color: #0080ff; font-style: italic } /* Comment.Single */
body .cs { color: #0080ff; font-weight: bold; font-style: italic } /* Comment.Special */
body .gd { background-color: #ffcccc; border: 1px solid #c5060b } /* Generic.Deleted */
body .ge { font-style: italic } /* Generic.Emph */
body .gr { color: #ff0000 } /* Generic.Error */
body .gh { color: #2c5dcd; font-weight: bold } /* Generic.Heading */
body .gi { background-color: #ccffcc; border: 1px solid #00cc00 } /* Generic.Inserted */
body .go { color: #aaaaaa } /* Generic.Output */
body .gp { color: #2c5dcd; font-weight: bold } /* Generic.Prompt */
body .gs { font-weight: bold } /* Generic.Strong */
body .gu { color: #2c5dcd; font-weight: bold } /* Generic.Subheading */
body .gt { color: #c5060b } /* Generic.Traceback */
body .kc { color: #2c5dcd; font-weight: bold } /* Keyword.Constant */
body .kd { color: #2c5dcd; font-weight: bold } /* Keyword.Declaration */
body .kn { color: #2c5dcd; font-weight: bold } /* Keyword.Namespace */
body .kp { color: #2c5dcd } /* Keyword.Pseudo */
body .kr { color: #2c5dcd; font-weight: bold } /* Keyword.Reserved */
body .kt { color: #5918bb; font-weight: bold } /* Keyword.Type */
body .m { color: #5918bb; font-weight: bold } /* Literal.Number */
body .s { color: #00cc66 } /* Literal.String */
body .na { color: #2c5dcd; font-style: italic } /* Name.Attribute */
body .nb { color: #5918bb; font-weight: bold } /* Name.Builtin */
body .nc { text-decoration: underline } /* Name.Class */
body .no { color: #318495 } /* Name.Constant */
body .nd { color: #ff8000; font-weight: bold } /* Name.Decorator */
body .ni { color: #5918bb; font-weight: bold } /* Name.Entity */
body .ne { color: #5918bb; font-weight: bold } /* Name.Exception */
body .nf { color: #ff8000; font-weight: bold } /* Name.Function */
body .nt { color: #2c5dcd; font-weight: bold } /* Name.Tag */
body .ow { color: #2c5dcd; font-weight: bold } /* Operator.Word */
body .w { color: #cbcbcb } /* Text.Whitespace */
body .mb { color: #5918bb; font-weight: bold } /* Literal.Number.Bin */
body .mf { color: #5918bb; font-weight: bold } /* Literal.Number.Float */
body .mh { color: #5918bb; font-weight: bold } /* Literal.Number.Hex */
body .mi { color: #5918bb; font-weight: bold } /* Literal.Number.Integer */
body .mo { color: #5918bb; font-weight: bold } /* Literal.Number.Oct */
body .sa { color: #00cc66 } /* Literal.String.Affix */
body .sb { color: #00cc66 } /* Literal.String.Backtick */
body .sc { color: #00cc66 } /* Literal.String.Char */
body .dl { color: #00cc66 } /* Literal.String.Delimiter */
body .sd { color: #00cc66; font-style: italic } /* Literal.String.Doc */
body .s2 { color: #00cc66 } /* Literal.String.Double */
body .se { color: #c5060b; font-weight: bold } /* Literal.String.Escape */
body .sh { color: #00cc66 } /* Literal.String.Heredoc */
body .si { color: #00cc66 } /* Literal.String.Interpol */
body .sx { color: #318495 } /* Literal.String.Other */
body .sr { color: #00cc66 } /* Literal.String.Regex */
body .s1 { color: #00cc66 } /* Literal.String.Single */
body .ss { color: #c5060b; font-weight: bold } /* Literal.String.Symbol */
body .bp { color: #5918bb; font-weight: bold } /* Name.Builtin.Pseudo */
body .fm { color: #ff8000; font-weight: bold } /* Name.Function.Magic */
body .il { color: #5918bb; font-weight: bold } /* Literal.Number.Integer.Long */

 </style>
</head>
<body>
<h2></h2>

<div class="highlight"><pre>function output = zigzag(input)
 [r, c] = size(input);
 output = zeros(1, r * c);
 i = 1;
 j = 1;
 cnt = 1;
 
 while ((i &lt;= r) &amp;&amp; (j &lt;= c))
 output(cnt) = input(i, j);
 cnt = cnt + 1;
 if (mod(i + j, 2)) % odd =&gt; down
 if (i == r)
 j = j + 1;
 elseif (j == 1)
 i = i + 1;
 else
 i = i + 1;
 j = j - 1;
 end
 else % even =&gt; up
 if (j == c)
 i = i + 1;
 elseif (i == 1)
 j = j + 1;
 else
 i = i - 1;
 j = j + 1;
 end
 end
 end
end
</pre></div>
</body>
</html>
```

I think some lines are mistakenly recognized as **Literal.String**. And the demo page give this

![image](https://user-images.githubusercontent.com/20477228/86084063-74925d80-bace-11ea-9c3a-465d45d307a4.png)

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Weird highlighting of Matlab lexer #1490

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