如何删除字符串中的最后2个单词？

Question

我有一个包含地址的字符串,我想删除最后2个字的邮政编码.

例如 21 Lane Street London W10 2GH

我想删除'W10 2GH'

Answer 1

用\s*\w+\s+\w+$空字符串替换模式:

String s = "21 Lane Street London W10 2GH";
System.out.println(s.replaceFirst("\\s*\\w+\\s+\\w+$", ""));

生产:

21 Lane Street London

一个简短的解释:

\s*  # zero or more white space chars
\w+  # one or more alpha-nums (or underscore), specifically: [a-zA-Z0-9_]
\s+  # one or more white space chars
\w+  # one or more alpha-nums (or underscore)
$    # the end of the input