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Regular Expression
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(.*?)(?i:\bruby\b|willa)(.*?)
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Input 1
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rubychannel ruby Ruby RUBY this is ruby ruby is this I love Ruby so very much - ruby video charter project powerful - video ruby charter project powerful - video charter ruby project powerful - video charter project ruby powerful - video charter project powerful ruby willa is awesome too is willa awesome too willa is awesome willa too is willa awesome too willa
Extraction
rubychannel ruby Ruby RUBY this is ruby ruby is this I love Ruby so very much - ruby video charter project powerful - video ruby charter project powerful - video charter ruby project powerful - video charter project ruby powerful - video charter project powerful ruby willa is awesome too is willa awesome too willa is awesome willa too is willa awesome too willa