验证变量是否为数字

Question

如何验证变量是批处理文件中的数字？

1, 2, 4, 5, 10934, 495832945, 4395893428 ->  true
Apple, Orange, Animal, Red, Sky, Leaf -> false

Answer 1

echo %variable%| FINDSTR /R /X " *[0-9]* *" >nul 2>&1 && echo IT IS A NUMBER
echo %variable%| FINDSTR /R /X " *[0-9]* *" >nul 2>&1 || echo IT IS NOT A NUMBER

Answer 2

在StackOverflow.com上找到答案

set /p Input1=Enter number: 
set /a Input2=%Input1% * 1
if "%Input2%"=="0" echo It is not a number.

它不适用于0到0.9的数字。

Answer 3

来自http://www.robvanderwoude.com/sourcecode.php?src=isnumber_nt [ Alt Link ]

:: Positive decimal
SET RC=10
FOR /F "tokens=1 delims=0123456789" %%A IN ("%Value%") DO SET RC=0
IF %RC% EQU 10 EXIT /B 10