regex - Regular Expressions AND

I am really not good with regular expressions and I come here for some assistance :). I am trying to combine regular expressions with something like AND. For example if we have a text file with:

abc1-xyz

abc1-ertxyz


abc1xyz

postxyz

abc1

I would like to match everything that starts with "abc1" AND also contains the letters "xyz" somewhere.

I know that I can start with:

/^abc1/

but I am not sure how to combine so it can also match to contain "xyz".

Thank you for your assistance in advance.