AEJuice Replace Expressions is a script for After Effects built to replace expressions across an entire project in one click. You set a scope, type what to search for and what to replace it with, then press Replace. The scope can be the whole project, a selection, the active composition, selected layers, or selected properties, and a separate option controls whether the script runs through nested compositions.
The script is optimized for speed, and AEJuice uses it in-house across all their packages. It supports After Effects CC 2015, CC 2017, CC 2018, CC 2019, CC 2020, CC 2021, CC 2022, or higher, matching the same range for its requirements.
Listed on Toolfarm at popularity rank 375, it sits within the wider set of AEJuice tools for After Effects. This catalog lists it as free; check the developer's page for current licensing details before you download.