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.

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。

youdao

This expression is then retained by the Pattern class before it is passed on to the Matcher class to check for matches in the context of a character sequence.

Pattern 先保存要使用的表达式，然后将其传递给 Matcher 类以便在字符序列的上下文中检查其匹配情况。

youdao

This function is not smart enough to identify the character values in the final example of use and thus be able to warn the user. You could use a string pattern matching test such as.

这个函数还不够灵巧，不能区分最后使用的示例中的字符值，所以不能警告用户。

youdao

Dr. TRENBERTH: Well, as we look around the world, there is a pattern of changes in the character of rainfall in particular.

NPR: Can Climate Change Explain Odd Weather?

At its core, this pattern involves deception with respect to the true character of the proposed school, its association with the Gulenists, and the myriad problems such Gulen academic institutions have presented to school system administrators and taxpayers from Texas to Maryland.

CENTERFORSECURITYPOLICY: Center For Security Policy

Unfortunately, a pattern is being established whereby President Obama routinely exaggerates the Muslim character of America.

CENTERFORSECURITYPOLICY: Deciphering Obama in Cairo