pattern match

tostay2003 · #1 (**permalink**) 12-31-2008

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.

Christoph Spohr · #2 (**permalink**) 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

tostay2003 · #3 (**permalink**) 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

Christoph Spohr · #4 (**permalink**) 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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