Extracting content from meta tag PHP MYHTML DOM

There is a meta tag I need to isolate and extract data from and it looks like this.  The selector description has a colon in it and I'm not sure if this an issue or its just my syntax.  I tried to get around it with a wildcard search but it did nothing either.

<meta name="somefield:withColons" content="I need whats here in plain text">

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I have tried a few things that I'm showing below but can not get the value to show up.  I get no errors either on some, just nothing but I know its there...

NOTHING BELOW HERE WORKS FOR ME
$myVar=$html->find("meta[name='somefield:withColons']")->content;
$myVar=$html->find(meta[name*=somefield)->content;
$myVar=$html->find("meta[name='somefield:withColons']")->plaintext;
$myVar=$html->find(meta[name*=somefield)->plaintextt;

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