Bash命令检查变量名是否有效

Question

#check if the name is valid
function myfunc()
{
    #check "${1}"
    #echo "valid/invalid"
}

#these should return valid
myfunc "my_number"
myfunc "my_number1"

#these should return ivalid 
myfunc "1my_number"
myfunc "1my _number"
myfunc "my number"
myfunc "my_number?"

等变量名只能有字母,数字(但不能在开头),...和java的所有规则一样......

我可以使用任何功能吗？我不想重新发明轮子......

Answer 1

将变量名称与正则表达式匹配,如下所示:

myfunc() {
    if [[ "$1" =~ ^[a-z][a-zA-Z0-9_]*$ ]]
    then
        echo "$1: valid"
    else
        echo "$1: invalid"
    fi
}