Regexp_Instr returns the location (beginning) of a pattern in a given string : REGEXP_INSTR « Regular Expressions Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Regular Expressions Functions » REGEXP_INSTR

18. 2. 1. Regexp_Instr returns the location (beginning) of a pattern in a given string

REGEXP_INSTR extends the regular INSTR string function by allowing searches of regular expressions.

The simplest form of this function is:


REGEXP_INSTR(source_string, pattern_to_find)

This part works like the INSTR function.

The general format for the REGEXP_INSTR function with all the options is:

source_string is the string in which you wish to search for the pattern.
pattern_to_find is the pattern that you wish to search for in a string.
position indicates where to start searching in source_string.
occurrence indicates which occurrence of the pattern_to_find (in the source_string) you wish to search for.
For example, which occurrence of "si" do you want to extract from the source string "Mississippi".
return_option can be 0 or 1.
If return_option is 0, Oracle returns the first character of the occurrence (this is the default);
if return_option is 1, Oracle returns the position of the character following the occurrence.
match_parameter allows you to further customize your search.
"i" in match_parameter can be used for caseinsensitive matching
"c" in match_parameter can be used for casesensitive matching
"n" in match_parameter allows the period to match the new line character
"m" in match_parameter allows for more than one line in source_string


SQL>

SQL> SELECT REGEXP_INSTR('Mississippi', 'si', 1,2,0,'i') FROM dual;



REGEXP_INSTR('MISSISSIPPI','SI',1,2,0,'I')

------------------------------------------

                                         7



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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