Use a variable within variable substrings in batch [duplicate]

Question

So I want to extract 2 and 3 from the test string by a variable that is set separately, number. But when I try to do this it outputs: 2 where it should output 23. Any advice helps, thank you!

SET test=123
SET number=2

SET two=%test:~1,%number%%

ECHO two

Read the explanations at this answer. Although the topic is different, the solution is the same... — Aacini
– Aacini, Commented Jul 3, 2018 at 19:41

Excallypurr · Accepted Answer · 2018-07-03 20:12:09Z

1

To solve this issue you must use SETLOCAL EnableDelayedExpansion and ! instead of % for the SET statement like so,

SET t=!test:~1,%number%!

If I understand this correctly, the ! makes the interpreter read test:~1, %number% instead of before where it was reading test:~1 and number separately due to the interpreter thinking the expression was closed because of using two % symbols. In another way, it thought you meant two expressions because of the paired % symbols. Thanks to Aacini for linking this answer which helped me find the solution!

edited Jul 3, 2018 at 20:12

answered Jul 3, 2018 at 19:59

Excallypurr

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3 Comments

Squashman Over a year ago

Yes. Same concept as one of your previous questions. set operator=!operator[%operator%]!

Excallypurr Over a year ago

Thanks, am I mistaken in asking another question about a specific function of a different bit of code?

Aacini Over a year ago

May I ask you to upvote the other answer?

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