feat: add regex support to operator_contains#330
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When STRING2 matches /pattern/ or /pattern/flags format, perform regex matching instead of plain substring search. Invalid regex patterns return false. Existing plain string behavior is preserved. Closes #329 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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…tor-contains-regex feat: add regex support to operator_contains
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Summary
operator_containsブロックの STRING2 に/pattern/flags形式を指定すると、正規表現マッチングを行うようにする拡張。/pattern/または/pattern/flags形式を検出し、RegExpでマッチングg,i,m,s,u,yをサポートfalseを返す（エラーにならない）Implementation Steps
containsメソッドに正規表現ロジック実装Definition of Done
operator_containsブロックの STRING2 に/\d+/を入力し、STRING1 に"abc123"を入力してtrueになる/hello/iで大文字小文字無視マッチが動作するapplecontainsa）が引き続き動作する/[/）でエラーにならないRisks
/文字列/で部分文字列検索するケースが正規表現として解釈される → 稀なケースのため許容Closes #329