grep and egrep with regular expression
| CTRL + H | |
|---|---|
| punctuation | \p{Punct}+ |
| number | [0-9]+ |
| start with number | ^[0-9]+ |
| remove all letters | [a-z]|[A-Z] |
| all letters ( including Chinese char ) | [[:alpha:]] [\u\l] |
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