r - merging matrix columns that exists inside a numerical list -

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i have created list following 1 contains combinations of specific character inside string. code creates list follows :

library(stringr) test = str_locate_all("ttest" , "t") ind1 = lapply( lapply(1:nrow(test[[1]]), combn , x=test[[1]][,1])  , t ) ind1[[1]] = rbind(ind1[[1]], 0 )

and list i'm getting looks like

[[1]]      [,1] [1,]    1 [2,]    2 [3,]    5 [4,]    0  [[2]]      [,1] [,2] [1,]    1    2 [2,]    1    5 [3,]    2    5  [[3]]      [,1] [,2] [,3] [1,]    1    2    5

what want combine/collapse columns (where ever more one) , unlist whole object in order create final vector c(1, 2, 5, 0, 1:2, 1:5, 2:5, 1:2:5 ) , able use expand.grid() function later.

tried solve following code partially ":" character went on different position wanted.

do.call(paste, c( as.data.frame(ind1[[2]]) ,collapse=":") ) [1] "1 2:1 5:2 5"

here idea via base r convert list elements data frames , use do.call paste them, i.e.

unlist(lapply(ind1, function(i) do.call(paste, c(as.data.frame(i), sep = ':')))) #[1] "1"     "2"     "5"     "0"     "1:2"   "1:5"   "2:5"   "1:2:5"




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