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Incorrect namedGroup index when lookbehind assertions present #27

@JLHwung

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@JLHwung
var regexpuCore = require("regexpu-core")

regexpuCore(/(?<=a)(?<a>[a])/, "", {
  namedGroup: true,
  lookbehind: true,
  onNamedGroup(name, index) {
    console.log(name, index)
  }
})

Expected:
"a", 1

Actual:
"a", 2

REPL: https://runkit.com/embed/8tnpnhf0z1hu

Side note: This example comes from a regression test of babel.

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