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Shell Programming and Scripting

pattern match

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# 1  
Old 12-31-2008
pattern match
Hi all,

I have small comparison to make.

I have say two strings,
Code:
StringA="abcdefg"
StringB="abc"

I would like to have a statement which checks if the string contains the below pattern.

Code:
"a _ _ d _ f _"

StringA passes the test, where as StringB fails the test

How can I make such comparison, without using grep or sed.
# 2  
Old 12-31-2008
Hi,

try:

command:
Code:
[[ "abc" =~ "a..d.f." ]] && echo hit || echo miss

output:
Code:
miss

command:
Code:
[[ "abcdefg" =~ "a..d.f." ]] && echo hit || echo miss

output:
Code:
hit

HTH Chris
# 3  
Old 12-31-2008
Thanks for the quick reply,

I am getting the following error though,

Quote:
syntax error at line xxx : `=~' unexpected
I am using korn shell, if at all it helps
# 4  
Old 12-31-2008
The "=~" operator is a feature of bash 3.0 of higher.
In ksh you could use something like:

command:
Code:
grep -q "a..d.f." <<< "abcdefg" 
[[ $? = 0 ]] && echo hit || echo miss

output:
Code:
hit

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