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Backreferences in ignore-cases regexps are not resolved correctly #25

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RunDevelopment opened this issue Mar 8, 2021 · 0 comments
Closed

Backreferences in ignore-cases regexps are not resolved correctly #25

RunDevelopment opened this issue Mar 8, 2021 · 0 comments
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bug Something isn't working

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@RunDevelopment
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Right now, /(a)\1/i is resolved as /aa|AA/. This is incorrect. Proof:

> /(a)\1/i.exec("aA")
[ 'aA', 'a', index: 0, input: 'aA', groups: undefined ]

The correct resolved regex is /aa/i.

Other examples:

  • /(a|b)\1/i -> /aa|bb/i == /AA|BB/i == /[Aa][Aa]|[Bb][Bb]/i
  • /([ab-])\1/i -> /AA|BB|--/i

This bug only affects ignore-case regexps.
@RunDevelopment RunDevelopment added the bug Something isn't working label Mar 8, 2021
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@RunDevelopment