Identifying columns through PiG - apache-pig

Question

I have data set like below :
"column,1A",column2A,column3A
"column,1B",column2B,column3B
"column,1C",column2C,column3C
"column,1D",column2D,column3D
What separator I should be using in this case to separate out above 3 columns.
First column value is => Column,1A
Second column value is => Column2A
Third column value is => Column3A

Answer 1

Let be try my code:
a = LOAD '/home/hduser/pig_ex' USING PigStorage(',') AS (col1,col2,col3,col4);
b = FOREACH a GENERATE REGEX_EXTRACT(col1, '^\\"(.*)', 1) AS (modfirstcol),REGEX_EXTRACT(col2, '^(.*)\\"', 1) AS (modsecondcol),col3,col4;
c = foreach b generate CONCAT($0, CONCAT(', ', $1)), $2 , $3;
dump c;

Answer 2

I am able to resolve it using the below steps:
Input:-
"column,1A",column2A,column3A
"column,1B",column2B,column3B
"column,1C",column2C,column3C
"column,1D",column2D,column3D
PiG Script :-
A = load '/home/hduser/pig_ex' AS line;
B = FOREACH A GENERATE FLATTEN(STRSPLIT(line,'\\,',4)) AS (firstcol:chararray,secondcol:chararray,thirdcol:chararray,forthcol:chararray);
C = FOREACH B GENERATE REGEX_EXTRACT(firstcol, '^\\"(.*)', 1) AS (modfirstcol),REGEX_EXTRACT(secondcol, '^(.*)\\"', 1) AS (modsecondcol),thirdcol,forthcol;
D = FOREACH C GENERATE CONCAT(modfirstcol,',',modsecondcol),thirdcol,forthcol;
DUMP D;
Output :-
(column,1A,column2A,column3A)
(column,1B,column2B,column3B)
(column,1C,column2C,column3C)
(column,1D,column2D,column3D)
Please let me know if there is any better way