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基本表達

abc – exactly this sequence of three letters
[abc] – any one of the letters a, b, or c
[^abc]– any character except one of the letters a, b, or c
[ab^c] – a,b,^ or c. （^擺在[後表否定，擺在中間表字元）
[a-z] – any one character from a to z
[a-zA-Z0-9] – any one letter or digit

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