[Python] How to extract text outside parentheses using regex?

I'm trying to extract the part of a string that is outside parentheses using regular expressions.

For example, from the input string:

"Hello (this is extra) world (more text)"



I want to extract:

"Hello world"



I’ve tried patterns like [^()]+, but they either remove too much or match what's inside the parentheses.

Can someone explain a correct regex pattern (with explanation) that captures only the text outside the parentheses, including cases with multiple sets of parentheses?

I'm working in Python, but a general explanation also helps.

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