regexp以匹配Java包名称 [英] regexp to match java package name

问题描述

我想检查在stdin中传递的参数是否符合有效的Java程序包名称.我有的正则表达式无法正常工作.在com.example.package中传递以下代码后，我收到了错误消息.我不确定我的正则表达式有什么问题吗?

I want to check if arguments passed in stdin to see if they conform to a valid java package name. The regex I have is not working properly. With the following code passing in com.example.package I receive the error message. I'm not sure what is wrong with my regex?

 regex="/^[a-z][a-z0-9_]*(\.[a-z0-9_]+)+[0-9a-z_]$/i"
 17         if ! [[ $1 =~ $regex ]]; then
 18                 >&2 echo "ERROR: invalid package name arg 1: $1"
 19                 exit 2
 20         fi

推荐答案

您非常接近正确的解决方案.只需稍微调整一下正则表达式(也可以考虑@fede的简单正则表达式)，然后为不区分大小写的匹配设置 nocasematch 选项.例如:

You are pretty close to the correct solution. Just tweak the regex a bit (also consider @fede's simpler regex) and set the nocasematch option for case insensitive matching. For example:

regex='^[a-z][a-z0-9_]*(\.[a-z0-9_]+)+[0-9a-z_]$'

shopt -s nocasematch
if ! [[ $1 =~ $regex ]]; then
  exit 2
fi
shopt -u nocasematch

您可能会被使用/regex/i (javascript)或 qr/regex/i (perl)定义不区分大小写的正则表达式的其他语言误导对象.

You are probably being misled by other languages that use /regex/i (javascript) or qr/regex/i (perl) for defining a case-insensitive regex object.

顺便说一句，使用 grep -qi 是另一种更可移植的解决方案.干杯.

Btw, Using grep -qi is another, more portable, solution. Cheers.

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