最后的 \p{Alpha}{2, 3} 表示两个或三个字母字符。
The final \p{Alpha}{2, 3} means two or three alphabetic characters.
该mgrs点精度为米，使用15个字符表示，其中最后10个字符表示指定网格中的以东和以北的值。
This MGRS point is accurate within one meter and is presented using 15 characters, where the last 10 characters are the easting and northing values within the specified grid.
结尾处的加号表示“查找最后字符串的一个或多个匹配”(星号表示“零个或多个”，问号表示“零个或一个”)。
The plus sign at the end means "match one or more of the last thing" (the asterisk is for "zero or more", and the question-mark is for "zero or one").
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