Re: Check for special character

From: Alexis Huxley (ahuxley_at_gmx.net)
Date: 10/28/04 

Date: Thu, 28 Oct 2004 09:49:05 +0200

> My script accept user input into a variable USRIP.
> I only want input to have (aA-zZ or 0-9).
> How do I check that the variable USRIP doesn't has special character (e.g
> #$* @ etc etc) and only has aA-zZ and 0-9?

How about:

        if ! expr "$USRIP" : '[a-zA-Z0-9]*$' > /dev/null; then
                echo "bad input"
                return 1 # or exit or whatever
        fi

Repeat the square-bracketed term to specify at least one
occurence of one of those chars if empty input is not
acceptable.

Alexis
            

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