StringSplit[s]StringSplit[s, pattern]StringSplit[s, {$p_1$, $p_2$, ...}]StringSplit[{$s_1$, $s_2$, ...}, {$d_1$, $d_2$, ...}]StringSplit["abc,123", ","]
By default any number of whitespace characters are used to at a delimiter:
StringSplit[" abc 123 "]
However if you want instead to use only a single character for each delimiter, use WhiteSpaceCharacter:
StringSplit[" abc 123 ", WhitespaceCharacter]
StringSplit["abc,123.456", {",", "."}]
StringSplit["a b c", RegularExpression[" +"]]
StringSplit[{"a b", "c d"}, RegularExpression[" +"]]
StringSplit["x", "x"]
Split using a delimiter that has nonzero list of 12's
StringSplit["12312123", "12"..]