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Extracting a number from a string under specific conditions
Learner IHi,
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
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0
Answers
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MartinLiebig Administrator, Moderator, Employee-RapidMiner, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,533
RM Data Scientist
Here we go, this should do it:<?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 John Alpha U23 Mike Beta C57 Ann Cole U73456 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>
- Sr. Director Data Solutions, Altair RapidMiner -
Dortmund, Germany1 -
It works!
Thanks a lot for your super fast reply!0 -
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which operator is used for this?
0
