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Match Chunks

match 0 or more times using * quantifier​

echo "hello, how are you?" | grep -e "[a-z]*" 
# will match hello, how, are, you

match all numbers in chunks with length of one or more with + quantifier​

echo "47427 8381481 5813471" | grep -P "[0-9]+" 
echo "47427 8381481 5813471" | grep -P "\d+"