Hitori is generic compile-time regular expressions library. It works by creating series of if-statements and for-loops for each expression.

See code samples along with the traits, impls and structs they expand to in examples.

Limitations

Pattern matching is step-by-step. It is impossible to to detach last element of a repetition. For example, using regex one can rewrite a+ as a*a and it would still match any sequence of as longer than zero. With hitori, however, a* would consume all the as, and the expression won't match.

Step-by step pattern matching also leads to diminished performance when matching large texts with an expression that contains repetitions of characters frequent in the text.

Crate features

• alloc (enabled by default) – string replace functions and blanket implementations of hitori traits for boxes using alloc crate.
• macros (enabled by default) – [impl_expr_mut] and [impl_expr] macros.
• find-hitori – finds hitori package to be used in macros even if it has been renamed in Cargo.toml. macros feature is required.