R 中級 Regular Expressions
Angelo Zehr
Data Journalist
\\d or [:digit:]
0, 1, 2, 3,…
\\w or [:word:]
a, b, c…, 1, 2, 3…, _
[A-Za-z] or [:alpha:]
A, B, C,…, a, b, c,…
[aeiou]
a
e
i
o
u
\\s or [:space:]
" "
str_match_all()
"Hi John_35", "\\d"
"3"
"5"
"Hi John_35", "\\w"
"H"
"i"
"J"
"o"
"h"
"n"
"_"
"Hi John_35", "[A-Za-z]"
"Hi John_35", "[aeiou]"
"Hi John_35", "\\s"
\\w{2}
\\w{2,3}
\\w{2,}
\\w+
\\w*
\\d
\\D
\\w
\\W
\\s
\\S
[a-zA-Z]
[^a-zA-Z]
str_match_all("Toy Story 3", "[\\d\\s]")
結果：
[,1] [1,] " " [2,] " " [3,] "3"
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