Question

我是正则表达式的新手。基本上，我想匹配＆＃34; private＆＃34;的所有实例，但仅当它们出现在构造函数的参数列表中时。

以下是我的示例文字：

constructor(
  private optionsService: OptionsService,
  private modalService: BsModalService,
  private renderer: Renderer2,
  private messageService: MessageService,
  private queryBuilderService: QueryBuilderService,
  private ltPlacementService: LtPlacementService,
  private sanitizer: DomSanitizer
) { } // All of the above should match

private someOtherVariable; // Should not match

有没有办法匹配构造函数（...）{}中的所有内容，然后匹配＆＃34; private＆＃34;的实例。只有在这个结果？提前谢谢。

Answer 1

要从constructor(匹配到) {，您可以使用constructor\(([\s\S]+(?=\)\s*{))，然后在捕获组（组1）中捕获其间的文本。

那将匹配

constructor按字面意思匹配
\(匹配（
(捕获小组（第1组）
- [\s\S]+匹配任何空白或非空白字符
- (?=确定后续内容的积极前瞻
  - \)\s*{匹配），零个或多个空格和{
- )关闭积极前瞻
)关闭捕获组

然后从第1组中的文字匹配private：

\bprivate\b

例如：

let string = `constructor(
  private optionsService: OptionsService,
  private modalService: BsModalService,
  private renderer: Renderer2,
  private messageService: MessageService,
  private queryBuilderService: QueryBuilderService,
  private ltPlacementService: LtPlacementService,
  private sanitizer: DomSanitizer
) { } // All of the above should match

private someOtherVariable; // Should not match`;

const pattern = /constructor\(([\s\S]+(?=\)\s*{))/g;
pattern.exec(string)[1].match(/\bprivate\b/g).forEach((p) => {
  console.log(p);
});

正则表达式匹配特定上下文中的关键字

1 个答案: