I need to extract data from a string but I can't use charindex. What should I use?

So in Beast Mode, I want to calculate a new field from a current field. I want to get the first two pieces of data from a string like

Email: DHE: DHE:read-more-horoscope-button

so that the new field would read 

Email: DHE

 

The pieces of data are 1) not a uniform character length, and 2) sometimes this current field only includes the two pieces (like "Navigation:Readings"). 

 

Any help with SQL suggestions is appreciated. Thanks! 

 

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