Using variable inside of for loop

Question

The idea is I want to check if a substring is inside of a string with Batch script.

For example I want to check if pass is inside of %rev%. If no for loop is related, I can do:

if /I "%rev:pass=%" neq "%rev%" (
echo String has pass
) else (
echo it doesnt has pass
)

But I don't know how to use this "%rev:pass=%" in side of a for loop when "%rev%" is replaced by %%g

My code is here:

FOR /F "tokens=*" %%g IN (test.txt) do (
if /I "%%g:pass=" neq "%%g" (
echo String has pass
) else (
echo it doesnt has pass
)
)

I need to check each string inside of this test.txt if it has substring pass. Any help is appreciated.

I try to change the form of %%g but still cannot make it happen. The main idea is to check each string in the file, if the string has pass as a sub-string

I always program Batch at a loss. If I want to do something more powerful than the simplest of actions, I always switch to a better script engine. Windows comes preinstalled with vbscript and javascript engines. I personally keep a copy of tclsh around. And you can put the code for any of them in a .bat file if you know the magic incantation at the top (easy to Google). — Dúthomhas
– Dúthomhas, Commented Jan 28, 2023 at 3:00
Find can show you each line containing the case insensitive string pass, i.e. @%SystemRoot%\System32\find.exe /I "pass" 0<”test.txt". Conversely @%SystemRoot%\System32\find.exe /I /V "pass" 0<”test.txt" will show you each line which doesn't contain the case insensitive string pass. You could also do it with FindStr: @%SystemRoot%\System32\findstr.exe /I "pass" ”test.txt", and @%SystemRoot%\System32\findstr.exe /I /V "pass" ”test.txt" respectively. — Compo
– Compo, Commented Jan 28, 2023 at 7:14

SomethingDark · Accepted Answer · 2023-01-28 02:45:00Z

1

You can't manipulate for loop variables directly, so you'll need to store them in regular variables first. However, since you can't ordinarily set and use variables inside of sets, you'll need to enable delayed expansion. This can be done by adding setlocal enabledelayedexpansion to the top of your script.

@echo off
setlocal enabledelayedexpansion

FOR /F "tokens=*" %%g IN (test.txt) do (
    set "line=%%g"
    if /I "!line:pass=!" neq "%%g" (
        echo String has pass
    ) else (
        echo it doesnt has pass
    )
)

answered Jan 28, 2023 at 2:45

SomethingDark

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Comments

Magoo · Accepted Answer · 2023-01-29 07:41:17Z

0

Try this. Will match if the case is UPPER or lower. It works by string replacement and comparison of before and after. Also gives a running hit count. Nifty.

setlocal EnableDelayedExpansion
FOR /F "delims= tokens=*" %%g IN (test.txt) do (
set "str1=%%g"
set "str2=!str1:pass=replace!"
if not !str1!==!str2! set /a i+=1 & echo YES - FOUND !i!)

Oh also. the other answer is wrong. The way it's written the two values will NEVER be equal. Try it.

edited Jan 29, 2023 at 7:41

Magoo

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answered Jan 28, 2023 at 8:48

i YAM GzORM

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1 Comment

Stephan Over a year ago

Despite the two values will NEVER be equal in SomethingDark's answer, it works (Try it). Either your statement is false, or there is some obscure magic at work...

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