regexp-tree

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`optimize` favors shortness over readability

3

I use `regexp-tree` via [eslint-plugin-unicorn/better-regex](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/master/docs/rules/better-regex.md) and found that some optimizations lead to less-readable output. Similarly to #135, I'd argue that readability and shortness might not always overlap. I found this...

fregante

Unnecessary escape

1

```js /[$@]?[a-zA-Z_\u0080-\uFFFF][\w\-\u0080-\uFFFF]*/g ``` Should optimize to ```diff - /[$@]?[A-Z_a-z\u0080-\uFFFF][\w\u0080-\uFFFF\-]*/g + /[$@]?[A-Z_a-z\u0080-\uFFFF][\w\u0080-\uFFFF-]*/g ``` Found in https://github.com/prettier/prettier/pull/7991/files#diff-855523a43e898c253460fcf0f6e5f2a1R980

fisker

Can it be used to give Firefox/Safari full ES2018 Regex support?

1

(My "issue" is documentation correction, and request for documentation clarification.) The README, under lookbehind assertions is out of date: >NOTE: Lookbehind assertions are not yet supported by JavaScript RegExp. It...

DarrenCook

Option for disabling character class and flag sorting in transformations

2

Hi, While I expect this might not be trivial given that the sorting presumably helps in building ranges, it would be very useful if this resorting could be optionally disabled....

brettz9

Parser/generator: implement PCRE mode

1

Currently we support only JavaScript regexes. However, _regexp-tree_ can be _language-agnostic_, and support any other formats/modes/syntaxes of regular expressions. Thus, `transform`, and `traverse` modules can be fully reused for any...

DmitrySoshnikov

Compat transpiler: Implement Unicode property escapes

3

Example: ```js /\p{ASCII_Hex_Digit}/u ``` Compiles to: ```js /[0-9A-Fa-f]/ ``` See example in https://mothereff.in/regexpu (@mathiasbynens)

DmitrySoshnikov

grammar expects regex to not end after a #comment with /x

1

The current comment grammar eats up the slash and flags after a comment when using the `x` flag: ~~~~ const re = `/ # A regular expression for date. (?\d{4})-...

dannybrian

Hello, Adding the meta specialCharacter '.' in a CharacterClass shouldn't lead to an error? Generate a regexp from ``` {"body": {"type":"CharacterClass", "expressions": [{"type":"Char","value":".","kind":"meta"}]}, "flags":"gm","type":"RegExp"} ``` has this result `/[.]/gm` Best...

Fazerty

In addition to the educational [finite-automata](https://github.com/DmitrySoshnikov/regexp-tree/tree/master/src/interpreter/finite-automaton) evaluator, we should implement the [regexp patterns semantics](https://tc39.github.io/ecma262/#sec-pattern-semantics) from the ECMAScript spec. Ideally this should be as close to the spec as possible, however...

DmitrySoshnikov

Optimizer or minifier ?

12

This is more of a question than an issue. Is the Optimizer more an optimizer or a minifier? Or both at the same time? Currently, the Optimizer does some "optimizations"...

Golmote