^文字列 ------------(行頭の文字列)
文字列 --------------(行末の文字列)
. ---------------------(任意の１文字)
文字* ---------------(文字の０回以上の繰り返し)
[文字] ---------------([]内のいづれかの１文字)
[文字1-文字2] ------(文字1と文字２の間にある１文字)
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