Variable DURATION_PATTERN`Const`

DURATION_PATTERN: "^-?P(\\d+Y)?(\\d+M)?(\\d+W)?(\\d+D)?(T(\\d+H)?(\\d+M)?((\\d+(\\.\\d+)?)S)?)?$"

Regex pattern for Temporal.Duration ISO 8601 duration strings (e.g. PT1H30M, P1Y2M3DT4H5M6.5S). Supports years, months, weeks, days, hours, minutes, and decimal seconds. A leading - is allowed for negative durations.