"string substitution" meaning in English

{
  "forms": [
    {
      "form": "string substitutions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "string substitution (plural string substitutions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Programming",
          "orig": "en:Programming",
          "parents": [
            "Computing",
            "Software engineering",
            "Technology",
            "Computer science",
            "Engineering",
            "Software",
            "All topics",
            "Sciences",
            "Applied sciences",
            "Media",
            "Fundamental",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The semantics-free search and replacement of one sequence of text characters with another."
      ],
      "id": "en-string_substitution-en-noun-KUss8YVG",
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "semantics-free",
          "semantics-free"
        ],
        [
          "search",
          "search"
        ],
        [
          "replacement",
          "replacement"
        ],
        [
          "text",
          "text"
        ],
        [
          "character",
          "character"
        ]
      ],
      "raw_glosses": [
        "(programming) The semantics-free search and replacement of one sequence of text characters with another."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Computational linguistics",
          "orig": "en:Computational linguistics",
          "parents": [
            "Computer science",
            "Linguistics",
            "Computing",
            "Sciences",
            "Language",
            "Social sciences",
            "Technology",
            "All topics",
            "Communication",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "31 69",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "29 71",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A mapping of letters to sets of strings, which creates a closed operation for regular and context-free languages."
      ],
      "id": "en-string_substitution-en-noun-fufCM~T2",
      "links": [
        [
          "computational linguistics",
          "computational linguistics"
        ]
      ],
      "raw_glosses": [
        "(computational linguistics) A mapping of letters to sets of strings, which creates a closed operation for regular and context-free languages."
      ],
      "topics": [
        "computational",
        "computing",
        "engineering",
        "human-sciences",
        "linguistics",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "string substitution"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "string substitutions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "string substitution (plural string substitutions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Programming"
      ],
      "glosses": [
        "The semantics-free search and replacement of one sequence of text characters with another."
      ],
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "semantics-free",
          "semantics-free"
        ],
        [
          "search",
          "search"
        ],
        [
          "replacement",
          "replacement"
        ],
        [
          "text",
          "text"
        ],
        [
          "character",
          "character"
        ]
      ],
      "raw_glosses": [
        "(programming) The semantics-free search and replacement of one sequence of text characters with another."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    },
    {
      "categories": [
        "en:Computational linguistics"
      ],
      "glosses": [
        "A mapping of letters to sets of strings, which creates a closed operation for regular and context-free languages."
      ],
      "links": [
        [
          "computational linguistics",
          "computational linguistics"
        ]
      ],
      "raw_glosses": [
        "(computational linguistics) A mapping of letters to sets of strings, which creates a closed operation for regular and context-free languages."
      ],
      "topics": [
        "computational",
        "computing",
        "engineering",
        "human-sciences",
        "linguistics",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "string substitution"
}