如何从javascript中的字符串中提取json？

var jsonString = '{"name":"John", "age":30, "city":"New York"}';
var jsonObj = JSON.parse(jsonString);
console.log(jsonObj);

{ name: 'John', age: 30, city: 'New York' }

var jsonString = '{"name":"John", "age":30, "city":"New York"} Some other text {"name":"Jane", "age":25, "city":"London"}';
var regex = /{[^{}]+}/g;
var jsonObjects = jsonString.match(regex);
console.log(jsonObjects);

[ '{"name":"John", "age":30, "city":"New York"}', '{"name":"Jane", "age":25, "city":"London"}' ]

var _ = require('lodash');
var jsonString = '{"name":"John", "age":30, "city":"New York"}';
var jsonObj = _.attempt(JSON.parse.bind(null, jsonString));
console.log(jsonObj);

{ name: 'John', age: 30, city: 'New York' }