我需要用尽可能多的另一个字符的副本替换一个选定的字符,以填充一个确定的空间(正好 12 个字符)。
例如,将 char '1' 替换为零个或多个 char '0':
ABC1 => ABC000000000
ABC1JKL => ABC000000JKL
1JKL => 000000000JKL
1000 => 000000000000
ABCDEFGHIJKL1 => ABCDEFGHIJKL
1ABCDEFGHIJKL => ABCDEFGHIJKL
ABCDEFGHIJKL => ABCDEFGHIJKL
1EFG1 => undefined (do not bother with this case)
EFG => undefined (do not bother with this case)