Appends @unescaped to @string, escaped any characters that are reserved in URIs using URI-style escape sequences.
a string
a string of reserved characters allowed to be used, or %NULL
set %TRUE if the escaped string may include UTF8 characters
Return: @string
2.16
See Implementation
Appends @unescaped to @string, escaped any characters that are reserved in URIs using URI-style escape sequences.