Regular expressions Modifier: (?ims-ims:...) #Matching certain words case-insensitively

[Invalid-Username404]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Modifier

What specific section or headline is this issue about?

Matching certain words case-insensitively

What information was incorrect, unhelpful, or incomplete?

const pattern = /(?:var|let|const) (?i:foo|bar)\b/i;

pattern.test("let foo;"); // true
pattern.test("const BAR = 1;"); // true
pattern.test("Let foo be a number"); // false

What did you expect to see?

The "-" after the first "?" is missing which turned into a non-capturing group.
const pattern = /(?-i:var|let|const) (?i:foo|bar)\b/i;

pattern.test("let foo;"); // true
pattern.test("const BAR = 1;"); // true
pattern.test("Let foo be a number"); // false

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response

MDN metadata

Page report details

• Folder: en-us/web/javascript/reference/regular_expressions/modifier
• MDN URL: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Modifier
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/web/javascript/reference/regular_expressions/modifier/index.md
• Last commit: cd0230e
• Document last modified: 2024-10-19T01:08:14.000Z

[Josh-Cena]

Great job being the first to discover this typo (which I've noticed for a while but never fixed it)! However, my typo was because I added i to the flag list—we should remove that. The first group is actually intended to be a non-capturing group.

[Invalid-Username404]

Thank you for the clarification. I noticed some issues in the JavaScript reference and apologize for not reporting them.