java - 正则表达式匹配特定字符串或数字

Question

我正在使用java编程语言。我想编写一个正则表达式，它与字符串开头的特定字符串(例如 boy) 或数字(从 5-8) 匹配。成功输入只能是:

1. 男孩....
2. 7 ....(这里的7可以替换为5、6、8)

如何做到这一点？

在所有其他情况下，返回值应为 false。任何解决方案或建议将不胜感激。

Answer 1

您可以使用此正则表达式:

^(boy|[5-8])

说明:

^ assert position at start of the string
1st Capturing group (boy|[5-8])
1st Alternative: boy
boy matches the characters boy literally (case sensitive)
2nd Alternative: [5-8]
[5-8] match a single character present in the list below
5-8 a single character in the range between 5 and 8