Batch file: Find if substring is in string (not in a file)

Question

In a batch file, I have a string abcdefg. I want to check if bcd is in the string.

Unfortunately it seems all of the solutions I\'m find

Answer 1

The solutions that search a file for a substring can also search a string, eg. find or findstr.
In your case, the easy solution would be to pipe a string into the command instead of supplying a filename eg.

case-sensitive string:
echo "abcdefg" | find "bcd"

ignore case of string:
echo "abcdefg" | find /I "bcd"

IF no match found, you will get a blank line response on CMD and %ERRORLEVEL% set to 1