Lack of essential detail about regexp lookbehind syntax in "Lookahead and lookbehind" article

Personne n'a encore pris cette issue.

[Part 3 (Additional articles)](https://javascript.info/#tab-3)
[Chapter 7 (Regular expressions)](https://javascript.info/regular-expressions)
[Article 14 (Lookahead and lookbehind)](https://javascript.info/regexp-lookahead-lookbehind)

Why you don't mention that in JS non fixed length regexps (including quantifiers, backreferences etc.) are not allowed inside lookbehind expression ?

First you talk about [lookahead](https://javascript.info/regexp-lookahead-lookbehind#lookahead), and using regexp with quantifier as lookahead condition in your example.

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For example, `\d+(?=\s)`**`(?=.*30)`** looks for `\d+` that is followed by a space `(?=\s)`, and there’s `30` somewhere after it **`(?=.\*30)`**

Right after this you briefly talk about [lookbehind](https://javascript.info/regexp-lookahead-lookbehind#lookbehind) and say it is the same thing but looks behind, without mentioning that it actually cannot do the same thing with non fixed lenght regular expressions (including quantifiers like **\***).

Commencez par l’article « Lookahead and lookbehind » mentionné dans l’issue, en particulier par ses sections sur lookahead et lookbehind. Comparez les exemples documentés avec les restrictions de JavaScript concernant les motifs de longueur variable dans les expressions lookbehind. Le travail sera considéré comme terminé lorsque l’article expliquera clairement cette limitation et distinguera le comportement de lookahead de celui de lookbehind.

Rédigé par le modèle d'indexation à partir du texte de l'issue.