Question

我正在修改读取用户电子邮件的脚本。它非常简单，太简单了。

echo -n "Please enter your example.com email address: "
read email
email=${email%%@example.com} # removes trailing @example.com from email
echo "email is $email"

这样可行，但仅适用于小写@ example.com。我怎么能修改它来删除尾随的@ example.com，不区分大小写？

Answer 1

如果你有bash 4：

email=${email,,}
email=${email%%@example.com}

否则，也许只使用tr：

email=$(echo "${email}" | tr "A-Z" "a-z")
email=${email%%@example.com}

<强>更新：

如果您只想剥离主机（任何主机），那么这可能就是您想要的：

email=${email%%@*}

Answer 2

对于Bash 3.2及更高版本：

shopt -s nocasematch
email='JoHnDoE@eXaMpLe.CoM'
pattern='^(.*)@example.com$'
[[ $email =~ $pattern ]]
email=${BASH_REMATCH[1]}    # result: JoHnDoE

Answer 3

这是另一个（虽然有点冗长）接受它：

email='JoHnDoE@eXaMpLe.CoM'
email=${email%%@[Ee][Xx][Aa][Mm][Pp][Ll][Ee].[Cc][Oo][Mm]}
echo "email is $email"

Answer 4

使用sed怎么样？

email="$(sed 's|@example\.com$||i' <<<"$email")"

请注意sed substitution命令中的'i'标志，该命令请求不区分大小写的匹配。

Answer 5

echo -n "Please enter your example.com email address: "
read _email
_email=$(echo $_email | awk 'BEGIN{ FS="@" }  {print $1}')
echo $_email

对于转发电子邮件到小写，您可以使用声明，例如

声明-l email = $ email

Answer 6

使用不区分大小写的正则表达式匹配：

echo -n "Please enter your example.com email address: "
read email
shopt -s nocasematch # Makes comparisons case insensitive
if [[ $email =~ example.com$ ]]; then
    domain=${BASH_REMATCH[0]}
    echo "email is ${email%%@$domain}"
fi

或者，您可以根据其长度截断一个字符串（仅当您知道用户正确输入域时才有意义）：

echo -n "Please enter your example.com email address: "
read email
domain=example.com
email_length=${#email}
domain_length=${#domain}
name_length=$(($email_length-$domain_length-1))
email=${email:0:$name_length} # removes trailing @example.com from email
echo "email is $email"

Bash脚本，如何删除尾随子串，不区分大小写？

6 个答案: