java regex

Hi all,

I am new to java 6 regex.

I have a string with the following content ( each line separated by \r\n).

Existing string:

aaaa|
TEST|x||y|z|""|cccc|bbb|"
xxxx|
TEST|x||y|z|Something|cccc|bbb|";
TEST|x|ST|y|z|""|cccc|bbb|";
TEST|x||y|z|""XYZ|cccc|bbb|";
TEST|x||y|z|Y""|cccc|bbb|";

The expected strign content:

aaaa|
TEST|x||y|z||cccc|bbb|
xxxx|
TEST|x|ST|y|z|Something|cccc|bbb|
TEST|x|ST|y|z|""|cccc|bbb|
TEST|x|ST|y|z|""XYZ|cccc|bbb|
TEST|x|ST|y|z|Y""|cccc|bbb|

Basically, if the content between 2nd and 3rd occurance of | is blank and if the content betweeen 5th and 6th occurance of | is "", then make it blank.(Ex: Line 2 in the EXISTING STRING)
Also if the content between 5th and 6th occurrence is not empty and not "" then if the content between 2nd and 3rd occurance of | is blank make it ST.(eX: Line 4,6,7 in existing string)
In other scenarios, nothing needs to be changed.
How to make it possible with Regex replaceall or Pattern/match.

I tried few things but in vain. - str.replaceAll( "(TEST\\\\|[\\|\\|]*\\\\|\\\\|[\\|\\|]*\\\\|[\\|\\|]*\\\\|)\"\"\\|", "$1\\|" ); - I t does not work for 4,6,7 lines/scenarios.

Please help as I have a dealine to meet.

Thanks a ton in advance.

Rehash and virtually a double post of http://www.coderanch.com/t/511294/java/java/java-regex (only replacing the caret with the pipe character).

edit BeForthrightWhenCrossPostingToOtherSites
http://www.java-forums.org/advanced-java/32834-regex-search-replace.html

Any help please!

How to check if the content between 5th and 6th occurence of | has alphanumeric content and then check if the content between 2nd and 3rd | is empty, if so, make it STR.

My current regex is replacing all empty positions with STR. But I need it to change it only between 2nd and 3rd position.

Regex I am using:
(STR\\|[\\|\\|]*\\\\|)\\|\\|", "$1|STR|" );

The current (wrong output):

TEST|x|STR|y|z|Y""|cccc|bbb|STR|"

Any help is appreciated.