下面是[正则表达式](https://www.geeksforgeeks.org/regular-expressions-in-java/)提取每个单词的第一个字母。它使用'/b '(边界匹配器之一 ...

Java’s character and assorted string classes offer low-level support for pattern matching, but that support typically leads to complex code. For simpler and more efficient coding, Java offers the ...