Dealing with URL’s

SQL> create or replace function utl_url_escape(x varchar2) return varchar2 is
  2  begin
  3    return utl_url.escape(x,true);
  4  end;
  5  /

Function created.

SQL> col escaped_char format a20
SQL> WITH special_chars
  2  AS (SELECT '<' AS sp_char FROM dual UNION ALL
  3      SELECT '>' AS sp_char FROM dual UNION ALL
  4      SELECT '.' AS sp_char FROM dual UNION ALL
  5      SELECT '#' AS sp_char FROM dual UNION ALL
  6      SELECT '{' AS sp_char FROM dual UNION ALL
  7      SELECT '}' AS sp_char FROM dual UNION ALL
  8      SELECT '|' AS sp_char FROM dual UNION ALL
  9      SELECT '\' AS sp_char FROM dual UNION ALL
 10      SELECT '^' AS sp_char FROM dual UNION ALL
 11      SELECT '~' AS sp_char FROM dual UNION ALL
 12      SELECT '[' AS sp_char FROM dual UNION ALL
 13      SELECT ']' AS sp_char FROM dual UNION ALL
 14      SELECT '<' AS sp_char FROM dual UNION ALL
 15      SELECT '`' AS sp_char FROM dual UNION ALL
 16      SELECT '+' AS sp_char FROM dual UNION ALL
 17      SELECT '/' AS sp_char FROM dual UNION ALL
 18      SELECT '?' AS sp_char FROM dual UNION ALL
 19      SELECT '&' AS sp_char FROM dual UNION ALL
 20      SELECT '''' AS sp_char FROM dual)
 21  SELECT sp_char
 22  ,      utl_url.escape(sp_char) AS escaped_char
 23  FROM   special_chars;

S ESCAPED_CHAR
- --------------------
< %3C
> %3E
. .
# %23
{ %7B
} %7D
| %7C
\ %5C
^ %5E
~ ~
[ [
] ]
< %3C
` %60
+ +
/ /
? ?
& &
' '

19 rows selected.