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This regular expression matches phone numbers formatted with the Russian or Kazakh country code, specifically +7(XXX) XXX-XX-XX. It looks for the literal +7, followed by a three-digit area code in parentheses, and then a seven-digit subscriber number separated by hyphens. Because it lacks an end-of-string anchor ($), it matches any text beginning with this specific phone number pattern. It is ideal for extracting or validating strictly formatted Kazakhstani or Russian phone numbers.