shell - How to replace a sentence with space on the basis of a pattern if it occurs in the middle of a sentence -

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suppose have line this:

aaaa ---- bbbb

i want erase ----bbbb part, want keep aaaa part in file. how can it?

using sed:

s='aaaa ---- bbbb' echo "$s"|sed 's/--* bb*/foo/' aaaa foo

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