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\d - Digits (0-9)\w - Word characters (a-z, A-Z, 0-9, _)\s - Whitespace characters. - Any character (except newline)* - 0 or more+ - 1 or more? - 0 or 1{n} - Exactly n{n,} - n or more{n,m} - n to m^ - Start of string$ - End of string\b - Word boundary