NIFI - link 3 columns

[#1]

Hello, I need link 3 column in all rows of the file, for example:

column1;column2;column3;2018;09;27

column1_1;column2_1;column3_1;2018;09;27

column1_2;column2_2;column3_2;2018;09;27

the output file must contains only 4 columns:

column1;column2;column3;20180927

column1_1;column2_1;column3_1;20180927

column1_2;column2_2;column3_2;20180927

The input file is .txt and the output file should be .txt

Thaks!!

[#2 · Accepted solution]

@Pepelu Rico

You can achieve this by using ReplaceText processor (or) UpdateRecord processor

Method1:Using UpdateRecord processor:

If you are working on larger number of rows then use UpdateRecord processor and define CSV Reader controller service with ; as value seperator.

Define CSV writer controller service add new property in the Processor as

/link3column as

concat(/col_4,/col5,/col6)

Refer to this link for configure/Usage of UpdateRecord processor.

Method2:Using ReplaceText processor:

Use this method if you are dealing with less number of records

Search Value

^((?:[^;]+;\s*){3})(.*)

Replacement Value

$1${'$2':replace(";","")}

Character Set

UTF-8

Maximum Buffer Size

1 MB //change this value according to your flowfile size

Replacement Strategy

Regex Replace

Evaluation Mode

Line-by-Line

In this method we are using regex to match until third ; to first capture group($1) and rest of the data into $2 capture group.

Making use of NiFi expression language we are replacing ";" in $2 capture group with ""

OutputFlowfile:

column1;column2;column3;20180927column1_1;column2_1;column3_1;20180927column1_2;column2_2;column3_2;20180927

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[#3]

Thanks @Shu , It has been very helpful!!