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"whitespace regular expression"

Hello everybody,

I want to search words from documents. I use the operator Filter Tokens by content with regular expression. If I want to search more than one word I use word1|word2|...|wordn. Now my question is how can I search an expression where there is a whitespace? For example "Research and Development|Word2|Word3 etc. ". Is there any wildcard for whitespaces?

Thanks for your help

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RalfKlinkenberg

You can use

[tt]\s[/tt] as a placeholder for a whitespace character,
[tt]\s+[/tt] for one or more whitespace characters, and
[tt]\s*[/tt] for zero, one, or more whitespace characters.
[tt]\t[/tt] is a placeholder for tabulator symbols.
[tt].[/tt] stands for an arbitrary character.

RapidMiner regular expressions use the Java syntax for regular expressions. If you search for "[tt]Java regular expressions[/tt]" with Google or another search engine, you will find a lot of documentation.

Example: "[tt]Research\sand\sDevelopment[/tt]" for "Research and Development".

Best wishes,
Ralf