/** ## `split_with_words` : 根据`文字部分`将句子进行切分
@example
words('fred, barney, & pebbles');
 // => ['fred', 'barney', 'pebbles']
  words('camelCaseHTTPRequest🚀');
 // => ['camel', 'Case', 'HTTP', 'Request', '🚀']
  words('Lunedì 18 Set')
 // => ['Lunedì', '18', 'Set']
@category format
 */
export declare function split_with_words(str: string): Array<string>;
/** ## `to_snake_case` : 将string进行[snake_case](https://developer.mozilla.org/zh-CN/docs/Glossary/Snake_case)转化
@example
```ts
  assert.equal(to_snake_case(''), '')
  assert.equal(to_snake_case('a'), 'a')
  assert.equal(to_snake_case('A'), 'a')
  assert.equal(to_snake_case('aA'), 'a_a')
  assert.equal(to_snake_case('aAa'), 'a_aa')
  assert.equal(to_snake_case('aAaA'), 'a_aa_a')
  assert.equal(to_snake_case('aAaAa'), 'a_aa_aa')
  assert.equal(to_snake_case('firstName'), 'first_name')

    assert.equal(to_snake_case('David Bob'), 'david_bob')

```
@category format
*/
export declare function to_snake_case(str: string): string;
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