I am working on a little project that can download and trim web page source code.
I am struggling to use the string parsing commands to get all text to the right of a specific line in the HTML code.

The program so far is able to retrieve the source code to any given page, but needs to be able to find a specific string(s) and store all of the text to the right of said string. eg;

<meta property="og:title" content="example text" />
    <meta property="og:test" content="text to parse here" />
    <meta property="og:description" content="text"
I am looking to only retrieve the text following
<meta property="og:test" content="
and trim off the last
 " />"
All other lines to be ignored

The size of this string can vary so a character count isn't reliable.

Any help would be greatly appreciated