SyntaxError: Invalid regular expression: invalid group specifier name

[sentry]

Sentry Issue: EXERCISM-JS-S

React ErrorBoundary SyntaxError: Invalid regular expression: invalid group specifier name
  at new HandledError (../app/javascript/components/ErrorBoundary.tsx:119:1)

SyntaxError: Invalid regular expression: invalid group specifier name
  at parseModule ([native code])
  at None ([native code])
  at asyncFunctionResume ([native code])
  at None ([native code])
  at promiseReactionJobWithoutPromise ([native code])
...
(1 additional frame(s) were not displayed)

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