regex - bash 正则表达式（或测试）奇怪的行为

Question

[myuser@mycomputer]$ word="hello"
[myuser@mycomputer]$ if [[ $word =~ "^hello$" ]]; then echo "it was a hello"; else echo "must have been a goodbye"; fi
must have been a goodbye

我不明白我的错误在哪里，但我期待相反的结果。

Answer 1

首先，您必须取消引用您的变量，使用$.

if [[ $word =~ "^hello$" ]]
      ^

然后，您不能将字符串括在双引号"中才能使用正则表达式。

if [[ $word =~ ^hello$ ]]