Cargo Features

[dependencies]
emote_mapper = { version = "0.1.2", default-features = false, features = ["re"] }
default = re

The re feature is set by default whenever emote_mapper is added without default-features = false somewhere in the dependency tree.

re default = lazy_static, regex

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

lazy_static re
regex re