Possible Duplicate:
Extracting a regex matched with ‘sed’ without printing the surrounding characters
How do I make this only print test
:
echo "atestb" | sed -n 's/(test)/1/p'
Answers:
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Method 1
You need to match the whole line:
echo "atestb" | sed -n 's/.*(test).*/1/p'
or
echo "atestb" | sed 's/.*(test).*/1/'
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