[英]Removing repeated letters/alphabets
Input : kdff455556tfkkkw 输入:kdff455556tfkkkw
Output1 : kdf[2]45[4]6tfk[3]w 输出1:kdf [2] 45 [4] 6tfk [3] w
Hint: Repeated "alphnum" by the alphnum[No_Of_Repetition] 提示:字母重复“字母” [No_Of_Repetition]
s <- c('kdff455556tfkkkw','abc','abbccc');
sapply(strsplit(s,''),function(x) paste(with(rle(x),ifelse(lengths==1,values,paste0(values,'[',lengths,']'))),collapse=''));
## [1] "kdf[2]45[4]6tfk[3]w" "abc" "ab[2]c[3]"
Here's a roundabout regex approach: 这是一种环回正则表达式方法:
require(stringr)
p <- "(([a-z0-9])\\2+)"
x <- str_split(s,p)
r <- sapply(str_extract_all(s,p),
function(x)if (length(x))paste0(substr(x,1,1),"[",nchar(x),"]")else "")
mapply(function(x,r)paste0(
c(x,r)[order(c(seq_along(x),seq_along(r)))]
,collapse=""),x,r)
# output for @bgoldst's input:
# [1] "kdf[2]45[4]6tfk[3]w" "abc" "ab[2]c[3]"
The last step is an interleaving trick copied from @Arun . 最后一步是从@Arun复制的交错技巧。
I wish my initial guess had worked: 我希望我最初的猜测能奏效:
sapply(s,function(x)gsub(p,paste0("\\2[",nchar("\\1"),"]"),x))
But it seems that "\\\\1"
is is not evaluated inside gsub
, and somehow always has two characters: 但似乎在
gsub
内未对"\\\\1"
进行求值,并且总有两个字符:
# kdff455556tfkkkw abc abbccc
# "kdf[2]45[2]6tfk[2]w" "abc" "ab[2]c[2]"
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