.md to .html highlight syntax for inline code vs code blocks using regex

Regex .md to .html Help

var pattern = /<code>(markup|css|javascript) ?(.+)<\/code>/gm;

/*
The goal is to turn this markdown (highlight syntax inline vs code block):
...for HTML (`markup .html`)...
to this HTML:
...for HTML (<code class="language-markup">.html</code>`)...
My current problem is due to the latter part of my pattern:
(.+)<\/code>
How do I ensure the capture ends exactly at the "</code>" character sequence?
*/