正则表达式匹配，如果不工作

Question

  

可能重复：
  How do I use regular expressions in bash scripts?

为什么这不起作用？

if [[ "foo" =~ "[f][o][o]" || "foo" =~ "(foo)" || "foo" =~ ".*" ]]
then
    echo "Success"
else
   echo "Fail"
fi
# Result: Fail
# Expected: Success

if [[ "foo" =~ "foo" ]]
then
    echo "Success"
else
   echo "Fail"
fi
# Result: Success
# Expected: Success

Answer 1

从每个正则表达式中删除引号：

if [[ "foo" =~ [f][o][o] || "foo" =~ (foo) || "foo" =~ .* ]]
then
  echo "Success"
else
  echo "Fail"
fi

显然，引号强制正则表达式被解释为文字字符串。