REGEXP_INSTR('abc','d?'): include the '?' repetition character : REGEXP_INSTR « Regular Expressions « Oracle PL / SQL

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Oracle PL / SQL » Regular Expressions » REGEXP_INSTR

REGEXP_INSTR('abc','d?'): include the '?' repetition character


 



SQL>

SQL> -- if we include the "?" repetition character, we get this seemingly odd result:

SQL>

SQL> SELECT REGEXP_INSTR('abc','d?') FROM dual;



REGEXP_INSTR('ABC','D?')

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

                       1



SQL>

Related examples in the same category

1.	regexp_instr function summary
2.	Simple demo for REGEXP_INSTR
3.	regexp_instr (string, pattern, position, occurence, return-option)
4.	Return-option is set to 1 to indicate the end of the found pattern
5.	regexp_instr (string, pattern, position, occurence, return-option, parameters): c: to match case sensitively
6.	'i': to match case insensitively
7.	regexp_instr (string, pattern)
8.	Returns the position of the second occurrence that matches the letter 'o' starting at position 10
9.	The simplest regular expression matches letters, letter for letter
10.	REGEXP_INSTR function in where clause
11.	Apecify any series of letters and find matches, just like INSTR
12.	REGEXP_INSTR(description,'ee') > 0
13.	REGEXP_INSTR('abc','d',1,1,1)
14.	REGEXP_INSTR('Mississippi', 'si', 1,2,0,'i')
15.	regexp_instr(comments, '[^ ]+', 1, 9)

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