"complemented class" meaning in English

{
  "forms": [
    {
      "form": "complemented classes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "complemented class (plural complemented classes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Regular expressions",
          "orig": "en:Regular expressions",
          "parents": [
            "Computing",
            "Programming",
            "Technology",
            "Software engineering",
            "All topics",
            "Computer science",
            "Engineering",
            "Software",
            "Fundamental",
            "Sciences",
            "Applied sciences",
            "Media",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Characters which are excluded in a pattern."
      ],
      "id": "en-complemented_class-en-noun-XEpZhT8Y",
      "links": [
        [
          "regular expression",
          "regular expression"
        ],
        [
          "pattern",
          "pattern"
        ]
      ],
      "qualifier": "regular expressions",
      "raw_glosses": [
        "(regular expressions) Characters which are excluded in a pattern."
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "negatoitu merkkiryhmä"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "classe complémentée"
        }
      ]
    }
  ],
  "word": "complemented class"
}

{
  "forms": [
    {
      "form": "complemented classes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "complemented class (plural complemented classes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Translation table header lacks gloss",
        "en:Regular expressions"
      ],
      "glosses": [
        "Characters which are excluded in a pattern."
      ],
      "links": [
        [
          "regular expression",
          "regular expression"
        ],
        [
          "pattern",
          "pattern"
        ]
      ],
      "qualifier": "regular expressions",
      "raw_glosses": [
        "(regular expressions) Characters which are excluded in a pattern."
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "negatoitu merkkiryhmä"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "classe complémentée"
    }
  ],
  "word": "complemented class"
}