Replace last comma in string - oracle sql

I have a field named per_first_names in a table named o_persons
Here is an example of the data within it:

mark, luisa, peter
victoria, lucy
john, charlotte, janice, andrew

i'd like to replace the last comma in the string with the word 'and', so the output would be:

mark, luisa and peter
victoria and lucy
john, charlotte, janice and andrew

is this possible using sql without a function? thankyou
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Helena Markováprogrammer-analystCommented:
SELECT substr('mark, luisa, peter',1,instr('mark, luisa, peter', ',' ,-1)-1)||'and '||
substr('mark, luisa, peter',instr('mark, luisa, peter', ',' ,-1)+1) from dual;
Helena Markováprogrammer-analystCommented:
Here is a little correction:
SELECT substr('mark, luisa, peter',1,instr('mark, luisa, peter', ',' ,-1)-1)||' and '||
substr('mark, luisa, peter',instr('mark, luisa, peter', ',' ,-1)+1) from dual;

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if you upgrade to 10g or later it gets even simpler...

select  regexp_replace(per_first_names,'(,)([^,]*$)',' and\2') from o_persons
tonMachine100Author Commented:
Thanks both
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