Here's an example of how to implement the regular expression in JavaScript:

```
const regex = /(query|mutation)\s*\{\s*[\w\s\(\)\:\,]+\s*\}/g;
const fileContents = `
query {
  getUser(id: 1) {
    name
    email
  }
}

mutation {
  createUser(data: {
    name: "John Doe",
    email: "john.doe@example.com"
  }) {
    id
  }
}
`;

let match;
while (match = regex.exec(fileContents)) {
  console.log(match[0]);
}
```

This will output:

```
query {
  getUser(id: 1) {
    name
    email
  }
}

mutation {
  createUser(data: {
    name: "John Doe",
    email: "john.doe@example.com"
  }) {
    id
  }
}
```
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