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@emacs_hhkb

【Ruby】インスタグラムのアカウント(ユーザ)名の正規表現

More than 1 year has passed since last update.

意外とスニペットが落ちていなかった

前提条件

  • 許可
    • 英数字
    • .(ピリオド)
    • _(アンダースコア)
  • 拒否
    • 先頭がピリオド
    • 末尾がピリオド
正規表現
\A(?!\.)[\w.]+(?<!\.)\z

解説

  • (?!\.) ピリオドで開始する事を否定(否定先読み)
  • [\w.]+ アルファベット・数字・アンダースコア・ピリオドの1回以上連続
  • (?<!\.) ピリオドで終了する事を否定(否定後読み)

参考

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