Adb Shell Regular Expression Doesn't Work As Tested Locally

First, sorry if my question is obscure or in an inconvenient format. This is my first post here :D. My issue is that I have a script, let's say test.sh which reads an input, and va

Solution 1:

The default shell in Android is mksh. It is not 100% compatible with bash. So do not expect all bash recipes to work without changes.

For the description of features supported by mksh - read its manual page.

Solution 2:

This is a GNU bash POSIX regular expression. In Korn Shell, you can use extglob regular expressions to the same effect:

if[[ $num = ?(-)+([0-9]) ]]; then
    …

See the section “File name patterns” in the manpage for details.

Solution 3:

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

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