It's usually better to put what you've tried so far: it demonstrates good will on your side, and helps others to understand what you're after. How (Not) To Ask A Question is a good reading in this case -- your question resembles some homework. Otherwise, you have to be prepared to answers like this

$str = 'Data';
[download]

that make me feel smart but that actually waste your time, my time and (unluckily for my XP), other monks' time.

Back to business, answers before this post concentrated in isolating all that's after the colon, more or less, but I suspect that you actually want to get rid of both 'Some text1 : ' and ' Some Text2'. The final word is up to you, so: what do you need exactly, and what have you tried so far?

Update: it seems that matze answered just before I was posting my comment, with a solution pointing towards my interpretation of your question. Good for you?