StringTake

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StringTake["string", n]

gives the first n characters in string.

StringTake["string", -n]

gives the last n characters in string.

StringTake["string", {n}]

gives the nth character in string.

StringTake["string", {m, n}]

gives characters m through n in string.

StringTake["string", {m, n, s}]

gives characters m through n in steps of s.

StringTake[{$s_1$, $s_2$, ...} spec}]

gives the list of results for each of the si.

Take the last 2 characters from several strings:

StringTake also supports standard sequence specifications

StringSplit
StringTrim