To make the .+ in your grep -Po command non-greedy (i.e., match as little as possible), you need to add a ? after the + quantifier.

Solution

Change your pattern to:

grep -Po '.+?(?=\t+zip$)' file

• .+? means: match one or more of any character, as few times as possible (non-greedy).

Explanation

• .+ is greedy by default, so it will match as much as possible.
• .+? is non-greedy, so it will match as little as possible before the lookahead (?=\t+zip$) is satisfied.

This ensures that the match stops at the first occurrence of \t+zip$ rather than the last.