@swift-6.0.3

do { let r = #/ (\d{4})\/ # 年 (\d{2})\/ # 月 (\d{2}) # 日 /# if let m = try r.firstMatch(in: "Birth date: 1980/10/28") { print(m.0) } } catch { print(error) }

3:12 PM

Swiftの正規表現リテラルって複数行やコメントに対応してたんだなあ。

3:13 PM

https://github.com/swiftlang/swift-evolution/blob/8767f694c86074e45be3be113f5bf6feb32d6344/proposals/0354-regex-literals.md?plain=1#L52 Proposalにちょろっと書いてある。

3:16 PM

An extended literal, #/.../#, ... When the opening delimiter is followed by a new line, it supports a multi-line literal where whitespace is non-semantic and line-ending comments are ignored.