adb shell正则表达式无法在本地测试 [英] adb shell regular expression doesn't work as tested locally

问题描述

首先，对不起，如果我的问题不清楚或格式不便。这是我的第一篇文章：D。

First, sorry if my question is obscure or in an inconvenient format. This is my first post here :D.

我的问题是我有一个脚本，比方说 test.sh 读取输入，并验证它是否为正整数（此帖子中使用的正则表达式：
）：

My issue is that I have a script, let's say test.sh which reads an input, and validates if it's a positive integer (reg ex used from this post: BASH: Test whether string is valid as an integer?):

#!/bin/sh
echo -n " enter number <"
read num

if [[ $num =~ ^-?[0-9]+$ ]]     #if num contains any symbols/letters 
then                            # anywhere in the string
  echo "not a positive int"
  exit
else
  echo "positive int read"
fi

我正在使用adb shell在Android设备（Xiaomi Mi3 w）上运行此脚本，并且错误：
语法错误： =〜意外的运算符不断显示。

I am running this script on my android device (Xiaomi Mi3 w) using adb shell and the error: syntax error: =~ unexpected operator keeps displaying.

首先，我的正则表达式是否正确？
其次，关于如何克服此语法错误的任何提示？

First, is my regex even correct? Second, any hints on how I can overcome this syntax error?

推荐答案

我必须使用如图所示的ksh表达式下面的内容来使其正常工作。

I had to use ksh expression as shown below to get this to work.

case $num in
    +([0-9])*(.)*([0-9]) )
          # Variable positive integer
      echo "positive integer"
          ;;
    *) 
          # Not a positive integer
      echo "NOPE"
      exit
          ;;
esac

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