March 2018
Intermediate to advanced
528 pages
13h 2m
Portuguese (Portugal, Brazil)
Content preview from R para Data Science
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Combinando Padrões com Expressões Regulares | 205
str_vie
w
( x,
"CC+" )
str_view( x, 'C[LX]+' )
Note que a precedência desses operadores é alta, então você pode escrever colou?r para
combinar tanto com a escrita norte-americana quanto com a britânica. Isso significa
que a maioria dos usos precisará de parênteses, como bana(na)+.
Você também pode especificar o número de combinações precisamente:
• {n}: exatamente n
• {n,}: n ou mais
• {,m}: no máximo m
• {n,m}: entre n e m
str_view( x, "C{2}" )
str_view ( x, "C{2,}" )
str_view( x, "C{2,3}" )
Por padrão, essas combinações são "gananciosas": elas combinarão com a string mais
longa possível. Você ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.