The Return-option is set to 1 to indicate the end of the found pattern : REGEXP_INSTR « Regular Expressions Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Regular Expressions Functions » REGEXP_INSTR 
18. 2. 10. The Return-option is set to 1 to indicate the end of the found pattern
SQL>
SQL> SELECT REGEXP_INSTR('This is a test','a',1,2,1position
  2  FROM dual;

  POSITION
----------
         0

SQL>
18. 2. REGEXP_INSTR
18. 2. 1. Regexp_Instr returns the location (beginning) of a pattern in a given string
18. 2. 2. REGEXP_INSTR(x, pattern [, start [, occurrence [, return_option [, match_option]]]]) searches for pattern in x.
18. 2. 3. Regexp_Instr
18. 2. 4. Parameters is a field that may be used to define how one wants the search to proceed:
18. 2. 5. Find the 's' and ignore case.
18. 2. 6. The simplest regular expression matches letters, letter for letter
18. 2. 7. SELECT REGEXP_INSTR('Two is bigger than One','One') where_it_is
18. 2. 8. Occurrence refers to the first, second, third, etc., occurrence of the pattern in S. The default is 1 (first).
18. 2. 9. Return-option returns the position of the start or end of the matched string.
18. 2. 10. The Return-option is set to 1 to indicate the end of the found pattern
18. 2. 11. Returns the position of the second occurrence that matches the regular expression s[[:alpha:]]{3} starting at position 1:
18. 2. 12. Returns the position of the second occurrence that matches the letter o starting at position 10 using REGEXP_INSTR()
18. 2. 13. Specify any series of letters and find matches, just like INSTR
18. 2. 14. regexp_instr(comments, '[^ ]+', 1, 9) > 0
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