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[match chunks 0+ times] #regex
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| # 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+" |
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