this is a preprocessor which invoke regex.replace_all() to replcae all chapter content
shell script
cargo install mdbook-regex-replacer
```toml [book] authors = ["blazh"] language = "en" multilingual = false src = "src" title = "test"
[preprocessor.regex-replacer] command="mdbook-regex-replacer"
[[preprocessor.regex-replacer.items]]
regex="==(?P
```