Search for specific pattern within strings of characters

Hi @komal_chenthama

The Filter Examples operator allows you to match by a regular expression. I can build one to give you an example. In your question, C means... the character "C" or it can be any character?

@sgenzer (do you mind if I write a tutorial on regular expressions with RapidMiner, to be included in the RapidMiner documentation?)

All the best,

Rodrigo.

Hi @komal_chenthama,

Filter Examples with expression and matches(..) is the way to go. Attached is an example process.

~Martin

<?xml version="1.0" encoding="UTF-8"?><process version="8.2.000">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="8.2.000" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="generate_data_user_specification" compatibility="8.2.000" expanded="true" height="68" name="Generate Data by User Specification" width="90" x="112" y="136">
        <list key="attribute_values">
          <parameter key="string" value="&quot;MKFFAAAALFATSAMAAVCPDGGLFSNPLCCSSILLEAVGLDCTTPTAPVVTAGLFQANCASIGKQPACCVAPLAGQGILCNNPAGT&quot;"/>
        </list>
        <list key="set_additional_roles"/>
      </operator>
      <operator activated="true" class="filter_examples" compatibility="8.2.000" expanded="true" height="103" name="Filter Examples" width="90" x="246" y="136">
        <parameter key="parameter_expression" value="matches(string,&quot;C.+.+.+CC.+.+.+C.+.+C.+.+CC.+.+C&quot;)"/>
        <parameter key="condition_class" value="expression"/>
        <list key="filters_list"/>
      </operator>
      <connect from_op="Generate Data by User Specification" from_port="output" to_op="Filter Examples" to_port="example set input"/>
      <connect from_op="Filter Examples" 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>

Hi @rfuentealba

Thanks for the quick response. In my example, I mean particularly the character "C". 

Cheers,

Komal

PS: I would very much appreciate a tutorial on regular expression with RapidMiner.

Hi @komal_chenthama

The regular expression you are looking for is pretty simple:

C(.+)CC(.+)C(.+)C(.+)CC(.+)C

Here is a capture on how it works when using it on the "Replace Operator".

See? It recognizes only the patterns you want.

Hope it helps.