Round and square brackets in regexp

Hello,
Can someone please explain to me what is the difference between:
SELECT REGEXP_INSTR('aoeeeeo','(i|e)o') position FROM dual;
and
SELECT REGEXP_INSTR('aoeeeeo','[ie]o') position FROM dual;
I mean, what is the main difference between round brackets with the alternation operator and square brackets in regular expressions?
Thank you very much,

It will perhaps be clearer if you look at it with more than just single characters...
SQL> select regexp_replace('this is fred and his test string', '(is|and)','XXX') from dual;
REGEXP_REPLACE('THISISFREDANDHISTES
thXXX XXX fred XXX hXXX test string
SQL> select regexp_replace('this is fred and his test string', '[isand]','XXX') from dual;
REGEXP_REPLACE('THISISFREDANDHISTESTSTRING','[ISAND]','XXX')
thXXXXXX XXXXXX freXXX XXXXXXXXX hXXXXXX teXXXt XXXtrXXXXXXg
SQL>The round brackets allow you to specify whole strings whereas the square brackets allow you to specify sets of individual characters.
Therefore in my first example it looks for IS or AND and replaces those.
In the second example it looks for any occurence of the characters I,S,A,N,D and replaces those.

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Round and square brackets in regexp

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