Extracting a number from a string under specific conditions

paolochip

Hi,

I'm struggling on doing something that looks easy (and maybe dumb), but I don't find a way. I need to extract a number from a string that matches specific conditions. I have a column with different strings like:

John Alpha U23

Mike Beta C57

Ann Cole U73456

Amy Utta J94857

I want RM to create a new colum that picks only numbers where there is the U in front and leave blank (or put something like none) on the other rows

23

none

73456

none

I'm not able to uniquely identify strings that contains both U and a number after. Is there a way to do that without using python or generativeAI blocks? By using a Split block with a regular expression like [^U[0-9]]{1,} it picks also the U of Amy, while I want select U only if it has followed by a number.

Thanks,

Paolo

MartinLiebig

Here we go, this should do it:

Spoiler

<?xml version="1.0" encoding="UTF-8"?><process version="10.2.000">

  <context>

    <input/>

    <output/>

    <macros/>

  </context>

  <operator activated="true" class="process" compatibility="10.2.000" 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="utility:create_exampleset" compatibility="10.2.000" expanded="true" height="68" name="Create ExampleSet" width="90" x="246" y="34">

        <parameter key="generator_type" value="comma separated text"/>

        <parameter key="number_of_examples" value="100"/>

        <parameter key="use_stepsize" value="false"/>

        <list key="function_descriptions"/>

        <parameter key="add_id_attribute" value="false"/>

        <list key="numeric_series_configuration"/>

        <list key="date_series_configuration"/>

        <list key="date_series_configuration (interval)"/>

        <parameter key="date_format" value="yyyy-MM-dd HH:mm:ss"/>

        <parameter key="time_zone" value="SYSTEM"/>

        <parameter key="input_csv_text" value="attribute&#10;John Alpha U23&#10;Mike Beta C57&#10;Ann Cole U73456&#10;Amy Utta J94857"/>

        <parameter key="column_separator" value=","/>

        <parameter key="parse_all_as_nominal" value="true"/>

        <parameter key="decimal_point_character" value="."/>

        <parameter key="trim_attribute_names" value="true"/>

      </operator>

      <operator activated="true" class="generate_copy" compatibility="10.2.000" expanded="true" height="82" name="Generate Copy" width="90" x="447" y="34">

        <parameter key="attribute_name" value="attribute"/>

        <parameter key="new_name" value="number"/>

      </operator>

      <operator activated="true" class="replace" compatibility="10.2.000" expanded="true" height="82" name="Replace" width="90" x="581" y="34">

        <parameter key="attribute_filter_type" value="single"/>

        <parameter key="attribute" value="number"/>

        <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="[\w|\s]+ U(\d+)"/>

        <parameter key="replace_by" value="$1"/>

      </operator>

      <operator activated="true" class="parse_numbers" compatibility="10.2.000" expanded="true" height="82" name="Parse Numbers" width="90" x="715" y="34">

        <parameter key="attribute_filter_type" value="single"/>

        <parameter key="attribute" value="number"/>

        <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="decimal_character" value="."/>

        <parameter key="grouped_digits" value="false"/>

        <parameter key="grouping_character" value=","/>

        <parameter key="infinity_representation" value=""/>

        <parameter key="unparsable_value_handling" value="replace with missing values"/>

      </operator>

      <connect from_op="Create ExampleSet" from_port="output" to_op="Generate Copy" to_port="example set input"/>

      <connect from_op="Generate Copy" from_port="example set output" to_op="Replace" to_port="example set input"/>

      <connect from_op="Replace" from_port="example set output" to_op="Parse Numbers" to_port="example set input"/>

      <connect from_op="Parse Numbers" 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>

paolochip

It works!

Thanks a lot for your super fast reply!

CKönig

xkcd: Regular Expressions

Tiimm

which operator is used for this?