批处理文件:从循环中的字符串末尾提取字符

Question

我想从字符串的末尾提取字符.

    SETLOCAL EnableDelayedExpansion

    SET str=123456789abcdefgh

    FOR /l %%x IN (1, 1, 10) DO (
       ECHO %%x
       SET result=%%str%:~-%%x%
       ECHO "Extracted characters: " !result!
    )

    ENDLOCAL

这是我错误的输出:

1
"提取的字符:"%str:〜-1

2
"提取的字符:"%str:〜-2

Answer 1

你不应该使用
SET result=%%str%:~-%%x%

相反,
SET result=!str:~-%%x!