Regular-Expresso Changeset

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Laman - 9 months ago 2024-07-15 13:50:50

added examples to the README

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README.md

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README.md

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 Written as an exercise in Rust and a refreshment of my university classes on finite automatons.
 The supported syntax is restricted to the following operators:
 * `*` - the Kleene star. The previous item can be present zero or more times.
 * Concatenation - is implied between items following each other. `ab*` matches an `a` followed by any number of `b`s
 * `+` or `|` - a union of several alternatives. Both symbols are equivalent.
@@ @@ -31,6 +32,19 @@ python regexp.py compare PATTERN1 PATTER @@
 ./target/release/regular-expresso compare PATTERN1 PATTERN2
 ```
 ### Example
 ```
 > ./regular-expresso match "(ab)*" abab
 true
 > ./regular-expresso match "(ab)*" aba
 false
 > ./regular-expresso compare "ab(ab)*" "a(ba)*b"
 None
 > ./regular-expresso compare "a*" "(_|a|aa)"
 aaa
 ```
 ## Theory
 . The pattern gets parsed into a tree of its parts.
 . We check which symbols can stand at the beginning, which can follow each other and which can stand at the end of the string. These data are used to construct a non-deterministic finite automaton (NFA).

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