options

Contracts which give the holder the right to buy (call options) or sell (put option) a fixed amount of a certain stock at a specified price within a specified time.

Contracts or agreements giving the holder the right (but not the legal obligation as with futures contracts) to buy or sell a commodity (such as agricultural products, metals, and energy fuels) or a financial instrument or stock at a stipulated price, quantity, and time.

See either switches or "regular expression modifier".