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How do i make input start with a letter?

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# 1  
Old 12-03-2014
How do i make input start with a letter?
Howdy folks,
How do i make the input start with a letter and certain num of numbers and if anything else is entered it should display error

for ex; a123455 is good ( exactly 7 characters)

and
ex: sio234234 is not good
ex: b233 is not good..
ex: jlasjdlfks is not good

Any help is appreciated.

Thanks
CK
# 2  
Old 12-03-2014
Code:
case "$INPUT" in
[a-z][0-9][0-9][0-9][0-9][0-9][0-9])
        echo "$INPUT is good"
        ;;
*)
        echo "$INPUT is bad"
        ;;
esac

This User Gave Thanks to Corona688 For This Post:
coolkid
# 3  
Old 12-04-2014
It is working. TY
This User Gave Thanks to coolkid For This Post:
Corona688
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