フリー問題

問題文

A translation pattern is being written with wildcards and with a leading plus sign. Which wildcard may be placed only at the end of the matching pattern, and which of the two pattern fields lets the plus sign sit after the group opening character?

選択肢

1. Held back to the end of the matching pattern is the letter X, and the plus sign may sit after the group opening character in the matching pattern field.
2. The exclamation mark is the wildcard held back to the end of the matching pattern, while the plus sign may sit after the group opening character in the replacement pattern field.
3. Kept back to the end of the matching pattern is the exclamation mark, and the plus sign may sit after the group opening character in the matching pattern field.
4. A letter X is the wildcard held back to the end of the matching pattern, while the plus sign may sit after the group opening character in the replacement pattern field.