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How to search for a pattern a string?

 
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# 1  
Old 10-16-2008
How to search for a pattern a string?
Hi all,

I'm new in UNIX , so how to check if stringA is present within stringB ?

Something similar to INSTR function in pl sql...

Thanks a lot.
Last edited by Leo_NN; 10-16-2008 at 11:11 AM..
# 2  
Old 10-16-2008
Try:

Code:
echo `expr index "$stringB" "$stringA"`

Regards
# 3  
Old 10-16-2008
Not sure if this works???

Quote:
> stringA="CUSTOMER HOUSEHOLD QUOTE POLICY"
> echo $stringA
CUSTOMER HOUSEHOLD QUOTE POLICY
> stringB="POLICY"
> echo `expr index "$stringB" "$stringA"`
1
> stringB="PPPPPP"
> echo `expr index "$stringB" "$stringA"`
1
# 4  
Old 10-16-2008
Sorry, probably misstyped it , so how it works?
If it returns '1' then stringB is within stringA , right?


Quote:
> echo $stringA
CUSTOMER HOUSEHOLD QUOTE POLICY
> echo $stringB
PPPPPPP
> echo `expr index "$stringA" "$stringB"`
26
> stringB="POLICY"
> echo `expr index "$stringA" "$stringB"`
1
# 5  
Old 10-16-2008
Here is a simple example that will work with both bash and ksh93
Code:
stringA="POLICY"
stringB="CUSTOMER HOUSEHOLD QUOTE POLICY"

if [[ $stringB =~ $stringA ]]
then
    echo "YES, stringA is present in stringB"
else
    echo "NO, stringA is not present in stringB"
fi

# 6  
Old 10-16-2008
!/usr/bin/ksh93

Quote:
> stringA="POLICY"
> stringB="CUSTOMER HOUSEHOLD QUOTE POLICY"
> if [[ $stringB =~ $stringA ]]
ksh: 0403-057 Syntax error: `=~' is not expected.
# 7  
Old 10-16-2008
check that your version of ksh is actually ksh93. It is not ksh93 if the following does not work
Code:
echo ${.sh.version}

You may have pdksh or ksh88.
 
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