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  1. digit_to_word() {
  2. 	case $1 in
  3. 	4) echo "four" ;;
  4. 	10) echo "ten" ;;
  5. 	14) echo "fourteen" ;;
  6. 	*) echo "$1" ;;
  7. 	esac
  8. }
  9.  
  10. write_input() {
  11. 	cat <<'EOF'
  12. I have two apples
  13. He has 4 apples 
  14. They have 10 pizzas
  15. 4 score and 14 years ago
  16. EOF
  17. }
  18.  
  19. regex='([[:space:]])([0-9]+)([[:space:]])'
  20.  
  21. write_input |
  22. while IFS= read -r line; do
  23.   line=" ${line} "  # pad with space so first and last words work consistently
  24.   while [[ $line =~ $regex ]]; do       # loop while at least one replacement is pending
  25.     pre_space=${BASH_REMATCH[1]}                # whitespace before the word, if any
  26.     word=${BASH_REMATCH[2]}                     # actual word to replace
  27.     post_space=${BASH_REMATCH[3]}               # whitespace after the word, if any
  28.     replace=$(digit_to_word "$word")  # new word to use
  29.     in=${pre_space}${word}${post_space}         # old word padded with whitespace
  30.     out=${pre_space}${replace}${post_space}     # new word padded with whitespace
  31.     line=${line//$in/$out}                      # replace old w/ new, keeping whitespace
  32.   done
  33.   line=${line#' '}; line=${line%' '}            # remove the padding we added earlier
  34.   printf '%s\n' "$line"                         # write the output line
  35. done
Success #stdin #stdout 0s 19672KB
comments (?)
stdin 
Standard input is empty
stdout 
I have two apples
He has four apples 
They have ten pizzas
four score and fourteen years ago
https://ideone.com/SOsuAD
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
public

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