Groovy抽取子串

下面是我的绳子

author = "59612934+firstname-lastname-ok@users.noreply.github.com"

如何从上面的字符串中仅获取firstname和lastname。lastname后面的字符串将始终为

-ok

期望输出：

author = "firstname.lastname"

---

我会用正则表达式替换它，比如

String author = "59612934+firstname-lastname-ok@users.noreply.github.com"
assert 'firstname.lastname' == author.replaceFirst( /\d+\+([^-]+)-([^-]+)-ok.*/, '$1.$2' )