Finding Characters only in string of lines

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I current have a batch script that executes a shell command which stdout to
the Windows shell a string of characters.

I capture the string of characters into a variable then write it into a text
file.

I would like to only capturer only a few characters that’s in the variable.

Example would be anything that starts with # and ends in ‘

In a nutshell I want to capture a number that is in the stdout of the
command.

This number always increments as the script runs.

# '243'

.

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