To see the difference between '*' and '+' : Wild Card « Regular Expressions « Oracle PL / SQL

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Oracle PL / SQL » Regular Expressions » Wild Card

To see the difference between '*' and '+'




SQL> -- To see the difference between "*" and "+", consider the next four queries.

SQL>

SQL> -- Here, we are asking to match an "a" and zero or more "b"s:

SQL>

SQL> SELECT REGEXP_SUBSTR('a','ab*') FROM dual;



R

-

a



SQL>

SQL>

Related examples in the same category

1.	'.' matches anything
2.	REGEXP_INSTR(description,'F.')
3.	REGEXP_INSTR(description,'e.e'): Find a letter and then whatever until there was another of the same letter
4.	REGEXP_INSTR(description,'i.i'): 'i' followed by any one character, followed by another 'i'
5.	REGEXP_SUBSTR('Yababa dababa do','a.a')
6.	REGEXP_SUBSTR('abbbb','ab+')
7.	REGEXP_SUBSTR('a','ab+')
8.	REGEXP_SUBSTR('abbbb','ab*') (2)
9.	'?': match exactly zero or one repetition
10.	'+': match one or more repetitions
11.	'*' (match zero or more repetitions)
12.	REGEXP_INSTR(description, 'e.+e'): An 'e' followed by any number of other characters and then another 'e'
13.	REGEXP_SUBSTR(description,'e.*e')
14.	Use the non-greedy '?'

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