Substitute Search result in RegEx with new line doesn't work

Hyperrick

Hello support team,

I might found a bug in the RegEx implementation of Rapidminer.
My goal is to replace a "blank" with a "new line" character.


Searching in following Text:

Sri Lanka

Using the Replace operator:

Search for

( )

Replace with:

\n

leads to:

SrinLanka

I created a workaround using the "split" operator which you also can see in my sample process.

So the question is: Is it possible to create a new line with RegEx in RM?

<?xml version="1.0" encoding="UTF-8"?><process version="9.7.002">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.7.002" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <process expanded="true">
      <operator activated="true" class="text:create_document" compatibility="9.3.001" expanded="true" height="68" name="Create Document" width="90" x="112" y="136">
        <parameter key="text" value="Sri Lanka"/>
        <parameter key="add label" value="false"/>
        <parameter key="label_type" value="nominal"/>
      </operator>
      <operator activated="true" class="text:documents_to_data" compatibility="9.3.001" expanded="true" height="82" name="Documents to Data" width="90" x="246" y="136">
        <parameter key="text_attribute" value="text"/>
        <parameter key="add_meta_information" value="true"/>
        <parameter key="datamanagement" value="double_sparse_array"/>
        <parameter key="data_management" value="auto"/>
        <parameter key="use_processed_text" value="false"/>
      </operator>
      <operator activated="true" class="multiply" compatibility="9.7.002" expanded="true" height="103" name="Multiply" width="90" x="447" y="136"/>
      <operator activated="true" class="split" compatibility="9.7.002" expanded="true" height="82" name="Split" width="90" x="648" y="289">
        <parameter key="attribute_filter_type" value="all"/>
        <parameter key="attribute" value=""/>
        <parameter key="attributes" value=""/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="false"/>
        <parameter key="split_pattern" value=" "/>
        <parameter key="split_mode" value="ordered_split"/>
      </operator>
      <operator activated="true" class="transpose" compatibility="9.7.002" expanded="true" height="82" name="Transpose" width="90" x="782" y="289"/>
      <operator activated="true" class="replace" compatibility="9.7.002" expanded="true" height="82" name="Replace" width="90" x="648" y="34">
        <parameter key="attribute_filter_type" value="all"/>
        <parameter key="attribute" value=""/>
        <parameter key="attributes" value=""/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="false"/>
        <parameter key="replace_what" value="( )"/>
        <parameter key="replace_by" value="\n"/>
      </operator>
      <connect from_op="Create Document" from_port="output" to_op="Documents to Data" to_port="documents 1"/>
      <connect from_op="Documents to Data" from_port="example set" to_op="Multiply" to_port="input"/>
      <connect from_op="Multiply" from_port="output 1" to_op="Replace" to_port="example set input"/>
      <connect from_op="Multiply" from_port="output 2" to_op="Split" to_port="example set input"/>
      <connect from_op="Split" from_port="example set output" to_op="Transpose" to_port="example set input"/>
      <connect from_op="Transpose" from_port="example set output" to_port="result 2"/>
      <connect from_op="Replace" from_port="example set output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>

Kind Regards,

Patrick

jacobcybulski

I am not sure how useful is this as the solution is a hack. Switch to the XML view of your process (you can bring in the XML panel in from View > Show Panel > XML, or you can edit the RMP text file directly). In the XML file find the "\n" string which you have entered in the Replace operator and change it to "
". If you worked in the XML panel, click the tick, switch back to the Process view and run. Here is an example from your process.

<?xml version="1.0" encoding="UTF-8"?><process version="9.8.000">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.8.000" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <process expanded="true">
      <operator activated="true" class="text:create_document" compatibility="9.3.001" expanded="true" height="68" name="Create Document" width="90" x="45" y="34">
        <parameter key="text" value="Sri Lanka"/>
        <parameter key="add label" value="false"/>
        <parameter key="label_type" value="nominal"/>
      </operator>
      <operator activated="true" class="text:documents_to_data" compatibility="9.3.001" expanded="true" height="82" name="Documents to Data" width="90" x="179" y="34">
        <parameter key="text_attribute" value="text"/>
        <parameter key="add_meta_information" value="true"/>
        <parameter key="datamanagement" value="double_sparse_array"/>
        <parameter key="data_management" value="auto"/>
        <parameter key="use_processed_text" value="false"/>
      </operator>
      <operator activated="true" class="replace" compatibility="9.8.000" expanded="true" height="82" name="Replace" width="90" x="313" y="34">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="text"/>
        <parameter key="attributes" value=""/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="false"/>
        <parameter key="replace_what" value="( )"/>
        <parameter key="replace_by" value="&#10;"/>
      </operator>
      <connect from_op="Create Document" from_port="output" to_op="Documents to Data" to_port="documents 1"/>
      <connect from_op="Documents to Data" from_port="example set" to_op="Replace" to_port="example set input"/>
      <connect from_op="Replace" from_port="example set output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>