此模式与任何不包含逗号的字符组匹配。

The pattern matches any group of characters not containing a comma.

youdao

模式n：使点匹配任何字符，包括新行。

Mode n: Make the dot match any character, including new lines.

youdao

字符表示匹配前面模式元素的零个或一个实例，* 字符表示匹配前面元素的零个或多个实例。

The ? character means to match zero or one instance of the previous pattern element; the * character means to match zero or more of the previous element.

youdao