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#!/bin/bash
s="say: a[aa] and a[aa]! to bbb, not ba[aa] or a[aa]b"
sed -E 's~([^_[:alnum:]]|^)a\[aa]([^_[:alnum:]]|$)~\1bbb\2~g' <<< "$s"

Success #stdin #stdout 0s 4468KB

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Standard input is empty

stdout

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say: bbb and bbb! to bbb, not ba[aa] or a[aa]b

https://ideone.com/0e0zf9

language:

Bash (bash 5.0.3)

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