Question

我可以检查字符串是否等于带有正则表达式的给定关键字。例如 :

Regex: /^hello$/
String: hello
Result: matches, as expected

Regex: /^goodbye$/
String: goodbye
Result: matches, as expected

Regex: /^bye$/
String: bye bye
Result: does not match, as expected

我无法做到的是检查字符串是否等于关键字。下面是一些我试图做到的例子:

Regex: ^(?!hello).*$
String: bye
Result: matches, as expected

Regex: ^(?!hello).*$
String: bye bye
Result: matches, as expected

Regex: ^(?!hello).*$
String: say hello
Result: matches, as expected

Regex: ^(?!hello).*$
String: hello you
Result: does not match, but should match because "hello you" is not equal to "hello"

我想我接近,但需要有人帮忙。以下是另一个例子:

Regex: ^(?!freshsfruits).*$
String: fresh fruits
Result: does not match, as expected

Regex: ^(?!freshsfruits).*$
String: lots of fresh fruits
Result: matches, as expected

Regex: ^(?!freshsfruits).*$
String: fresh fruits, love them.
Result: does not match, but should match

谢谢!

Answer 1

让我们在你的表达方式中加上失败的字句:

^(hello.+|(?!hello).*)$

因此,第一位匹配了哈罗, 后面还有保存空字符串的任何东西。 (我刚刚完成了一个自动数据类, 无法不把它看作是 {} :: P。) 第二位匹配任何以 < code> hello 开头的东西。

我认为,这涵盖了所有可能的情况。

Answer 2

(放下 . /code>)



(......固定的外表背后/头部混乱)

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