Bourne: search for a non-numeric character in $VAR

lumix · #1 (**permalink**) 12-14-2007

if $1 = "123x456", how can I test for the non-numeric character 'x' in that string. I've tried expr with "[^0-9]" but it did not find the x. Any ideas? Can this perhaps be done with sed?

Thanks.

radoulov · #2 (**permalink**) 12-14-2007

If only for unsigned integers:

bash3

Code:

bash 3.2.25(1)$ [[ 12345x6 =~ [^0-9] ]]&&printf "No digit found: %s\n" "$BASH_REMATCH"
No digit found: x

Otherwise:

Code:

v="12345x6"
case $v in (*[!0-9]*) printf "No digit found: %s\n" "$v";;esac

For old, old sh use this syntax:

Code:

case $v in *[!0-9]*) printf "No digit found: %s\n" "$v";;esac

P.S. Just noticed "Bourne"

If not bourne again 3, then [23]

lumix · #3 (**permalink**) 12-14-2007

I had a feeling it might require case. Thank you so much.

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