CODE EXAMPLE FOR SHELL

sed replace number of variable length

Just use one of following commands for replacing a number of:
sed "s/[0-9]//" f.txt	#One single digit as 1
sed "s/[0-9]+//" f.txt #Further digits as 837, specifying match repetition "+"
sed "s/[0-9+.[0-9]+]//" file.txt #Float type with decimals