How to check if a parameter (or variable) is a number in a Batch script

Question

I need to check if a parameter that is passed to a Windows Batch file is a numeric value or not. It would be good for the check to also works for variables.

I found a

Answer 1

I use this function instead, it seems to work for me without any issues...

The Script (mytestscript.bat)

REM == Script variables =============================================
SET "NUMCODE=%1"
SET "NAME=%2"

REM == Main script ==================================================
CALL :Validate "NUMCODE"
IF ERRORLEVEL 1 EXIT /B %ERRORLEVEL%
CALL :Validate "NAME"
IF ERRORLEVEL 1 EXIT /B %ERRORLEVEL%

ECHO Validation Complete and all variables passed validation.

REM == Functions ====================================================
:IsNumeric [string-value] [return-val]
    SET "stringVal=%~1"
    SET /A numericVal=%stringVal% > nul 2> nul
    IF "%stringVal%"=="%numericVal%" (SET "%~2=1") ELSE (SET "%~2=0")
    EXIT /B 0

:Validate
    SET PASSEDVALIDATION=0

    ECHO Validating %~1...

    IF "%~1"=="NUMCODE" (
        ECHO - Value: %NUMCODE%
        IF NOT "%NUMCODE%"=="" SET PASSEDVALIDATION=1
        IF "!PASSEDVALIDATION!"=="1" (
            CALL :IsNumeric %NUMCODE% RETVAL
            SET PASSEDVALIDATION=!RETVAL!
        )
        IF "!PASSEDVALIDATION!"=="1" (
            IF NOT %NUMCODE% GEQ 1 SET PASSEDVALIDATION=0
        )
        IF "!PASSEDVALIDATION!"=="1" (
            IF NOT %NUMCODE% LEQ 526 SET PASSEDVALIDATION=0
        )
        IF "!PASSEDVALIDATION!"=="0" (
            ECHO - The first parameter is invalid, it can not be blank.
            ECHO - Valid value is a number from 1 to 526.
            ECHO - Leading zeros are not valid.
        )
    )

    IF "%~1"=="NAME" (
        ECHO - Value: %NAME%
        IF NOT "%NAME%"=="" SET PASSEDVALIDATION=1
        IF "!PASSEDVALIDATION!"=="0" (
            ECHO - The second parameter is invalid, it can not be blank.
        )
    )

    IF "!PASSEDVALIDATION!"=="0" (
        ECHO - Failed validation.
        EXIT /B 1
    ) ELSE (
        ECHO - Passed validation.
    )
    EXIT /B 0

Usage Examples:

C:\mytestscript.bat 10 MrTest
Validating NUMCODE...
- Value: 10
- Passed validation.

Validating NAME...
- Value: MrTest
- Passed validation.

C:\mytestscript.bat 600
Validating NUMCODE...
- Value: 600
- The first parameter is invalid, it can not be blank.
- Valid value is a number from 1 to 526.
- Leading zeros are not valid.
- Failed validation.

C:\mytestscript.bat 10
Validating NUMCODE...
- Value: 10
- Passed validation.

Validating NAME...
- Value: 
- The second parameter is invalid, it can not be blank.
- Failed validation.