// Matches strings that look like dates using "/" as a separator.
// Examples: 3/10/2011, 31/10/96 or 08/31/95.
const SLASH_SEPARATED_DATES = /(?:(?:[0-3]?\d\/[01]?\d)|(?:[01]?\d\/[0-3]?\d))\/(?:[12]\d)?\d{2}/;

// Matches timestamps.
// Examples: "2012-01-02 08:00".
// Note that the reg-ex does not include the
// trailing ":\d\d" -- that is covered by TIME_STAMPS_SUFFIX.
const TIME_STAMPS = /[12]\d{3}[-/]?[01]\d[-/]?[0-3]\d +[0-2]\d$/;
const TIME_STAMPS_SUFFIX_LEADING = /^:[0-5]\d/;
export default function isValidPreCandidate(candidate, offset, text) {
  // Skip a match that is more likely to be a date.
  if (SLASH_SEPARATED_DATES.test(candidate)) {
    return false;
  }

  // Skip potential time-stamps.
  if (TIME_STAMPS.test(candidate)) {
    const followingText = text.slice(offset + candidate.length);
    if (TIME_STAMPS_SUFFIX_LEADING.test(followingText)) {
      return false;
    }
  }
  return true;
}
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