truncate string-valued variables

I would like to use a part of a string value . Is there a kind of function whereby a part of a string is truncated? (f.e. match question : 1-1,2-2)I would like to use a part of a string value . Is there a kind of function whereby a part of a string is truncated? (f.e. match question : 1-1,2-2)

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