Extract string between start string and end string using javascript

Answer 1

Yes.

var pt = string.match(/font-size:([\d.])+pt/)[1];

What do you want to do with that?

Answer 2

In the case you just want to get the font size of the respective element I would recommend not relying on parsing the string but rather access this property by using the DOM – as for example something like:

document.getElementsByTagName('font')[0].style.fontSize