你可以用正则表达式替换它，使用分组引用（(\d)周围的括号形成一个小数组，\1引用它）将确保你不会删除像“1.2.”这样的数字，并允许你在替换过程中引用它：

const data =
  { "question_1": 
    { "type"  : "string"
    , "title" : "1. 1. What did he want to make for dinner?"
    , "enum": 
      [ " a.) He wanted to make some salad and spaghetti"
      , " b.) He wanted to make some pasta salad"
      ] 
    , "required": false
    } 
  , "question_2": 
    { "type": "string"
    , "title": "2. 2. Did he have the ingredients to make dinner?"
    , "enum": 
      [ " a.) Yes, he had the ingredients"
      , " b.) No, he didn't have the ingredients"
      ] 
    , "required": false
    } 
  , "question_3": 
    { "type"  : "string"
    , "title" : "3. 3. Where did he go shopping?"
    , "enum": 
      [ " a.) He went to Albertsons"
      , " b.) He went to Albertos"
      ] 
    , "required": false
    } 
  };

Object.values(data).forEach(v => v.title = v.title.replace(/(\d)\. \1\./, '$1.'))
console.log(Object.values(data).map(v => v.title))

如果它实际上是JSON（您将使用JSON.parse解析它），则可以使用可选的reviver参数。

复苏剂

如果是函数，则指定解析最初生成的每个值在返回之前如何转换。不可调用的值将被忽略。函数使用以下参数调用：

按键

与值关联的键。

数值

分析生成的值。

const JSONString = `{
  "question_1": {
    "type": "string",
    "title" : "1. 1. What did he want to make for dinner?"
  },
  "question_2": {
    "type": "string",
    "title": "2. 2. Did he have the ingredients to make dinner?"
  } 
}`;

console.log(
  JSON.parse(JSONString, (key, value) => typeof value === 'string' ? value.replace(/(\d)\. \1\./, '$1.') : value)
)

扩展Moritz Ringler的解决方案。