{$str.len abcd}
str.len returns the length of a string.
{$str.index abcd 2}
str.index returns the character at a given index within a string.
{$str.range abcd 0 2}
str.range returns a substring, identified by two indexes within a string.
{$str.join , {a b c}}
str.join joins a list of strings, with a delimiter.
{$str.split a,b,c ,}
str.split splits a string, by a delimiter.
{$str.ord a}
str.ord returns the numeric value of a character.
{$str.chr 0x61}
str.chr returns the character associated with a given numeric value.
{$str.expand {a\tb}}
str.expand expands escape sequences in a string.
{$str.in bc abcd}
str.in determines whether a string is a subset of another string.
{$rtrim {a b }}
rtrim removes trailing whitespace from a string.
{$ltrim {a b }}
ltrim removes leading whitespace from a string.