How do I do full boolean text search in R? I am using str_match which works only with OR or | operator, or I use Reduce function with &. Is there a way to do AND, OR and XOR seamlessly for text search in R?
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1Please include a specific example. – nrussell Aug 20 '15 at 17:08
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An `and` for regex might be impossible, have a look at [here](http://stackoverflow.com/questions/3041320/regex-and-operator) and [here](http://stackoverflow.com/questions/469913/regular-expressions-is-there-an-and-operator). I think you need regex's `lockahead` and `lockbehind`. – SabDeM Aug 20 '15 at 17:08
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`library(stringi)` supports using `&` in char classes. For more info, read `help("stringi-search-charclass", package = "stringi")` – Rich Scriven Aug 20 '15 at 17:16
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Thank you SabDem and Richard Scriven. I will read the resources. – Apricot Aug 20 '15 at 17:29
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consider using the rlucene package which connects to the lucene search library which provides full-text search including a BooleanQuery which siport AND OR and NOT.
Oren Bochman
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Thank you Oren Bochman. Will try rlucene. Guess I have a steep learning curve ahead. – Apricot Aug 20 '15 at 17:30