Temporal Utils by Ian Macalinao
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    Variable PLAIN_MONTH_DAY_PATTERNConst

    PLAIN_MONTH_DAY_PATTERN: "^(--)?(0[1-9]|1[0-2])-(0[1-9]|[12]\\d|3[01])$"

    Regex pattern for Temporal.PlainMonthDay ISO 8601 strings (e.g. --01-15 or 01-15). Validates month (01–12) and day (01–31). The -- prefix is optional per ISO 8601.