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Stack Internal
Knowledge at work
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sed -i 's/\(topic\": "\)[a[A-Za-z_]*/\1test_1/' file.json
sed -i 's/\(topic\": "\)[a-z_]*/\1test_1/' file.json
sed -i 's/\(topic\": "\)[A-Za-z_]*/\1test_1/' file.json
