Regular Expression with comma and encapsulated charaters

Question

Would appreciate some help. Looking for a regular expression to remove comma's from encapsulated text as follows
For example
- Input
1,"This is a string, need to remove the comma",Another text string,10
- Required output
1,"This is a string; need to remove the comma",Another text string,10
Have tried to use the REGEXP_REPLACE but could not grasp the pattern matching.
Thanks John

Answer 1

John Heaton wrote:
Thanks for the solution,this works great for a single field encapsulated by " and containing ,. I am parsing several different file definitions so it would need to cascade through the string for a undetermined number of times and replace all occurrences. Then try (performance-wise) MODEL solution:
{code}
with t as (
select '1,"This is a string, need to remove the comma",Another text string,10' txt from dual union all
select '1,"remove this comma,",Another text string,10,"remove this comma,",xxx,"remove this comma,",11' txt from dual
select txt_original,
txt
from t
model
partition by(row_number() over(order by 1) p)
dimension by(1 rn)
measures(txt txt_original,txt,0 quote)
rules
iterate(
1e9
until(
iteration_number + 1 = length(txt[1])
quote[1] = case substr(txt[1],iteration_number + 1,1)
when '"' then quote[1] + 1
else quote[1]
end,
txt[1] = case substr(txt[1],iteration_number + 1,1)
when ',' then case mod(quote[1],2)
when 1 then substr(txt[1],1,iteration_number) || ';' || substr(txt[1],iteration_number + 2)
else txt[1]
end
else txt[1]
end
TXT_ORIGINAL TXT
1,"This is a string, need to remove the comma",Another text string,10 1,"This is a string; need to remove the comma",Another text string,10
1,"remove this comma,",Another text string,10,"remove this comma,",xxx,"remove this comma,",11 1,"remove this comma;",Another text string,10,"remove this comma;",xxx,"remove this comma;",11
SQL>
SY.