Hello,
I would like to substitute a substring of characters defined by a specific 
start and end sequence. 
i.e. in the example matrix below, I would like to substitute ".:X:" with "", 
where X varies in sequence...
 
m<-matrix(c(".:0:0,0", ".:2:0,2", ".:194:193,1", ".:56:0,56", ".:58:50,8", 
".:13:0,13",  ".:114:114,0", ".:75:75,0"), nrow=2)
 
output required:
     [,1]      [,2]          [,3]        [,4]         
[1,] "0,0" "193,1" "50,8" "114,0"
[2,] "0,2" "0,56"   "0,13" "75,0" 
 
Thank you for any help
Sarah
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