how do I decrease the binary size of this crate?

[BurntSushi]

cc @spencermountain who asked about it in an unrelated issue: #961

[BurntSushi]

Currently, there are generally three contributors to the large binary size and compile times for this crate:

1. Unicode data tables.
2. Performance optimizations.
3. A fair amount of practically indivisible code that's designed to handle lots of use cases. (Most of what's in regex-syntax, except for the Unicode tables.)

For (1) and (2), there are a number of crate features that can be toggled: https://docs.rs/regex/latest/regex/#crate-features

Specifically, try regex = { version = "1.7", default-features = false, features = ["std"] }.

For (3), there is some discussion about adding an entirely new regex-lite crate in #961 that focuses more heavily on reducing binary size and compilation time.