Regex to increment a number in text.

regex-increment-number.sh

#!/bin/sh

# Regex to increment a number in text.
# Source: https://stackoverflow.com/a/31599758/761771

echo " 0 1 2 3 7 8 9 10 19 99 109 199 909 999 1099 1909" |
perl -pe 's/\b([0-9]+)\b/0$1~01234567890/g' |
perl -pe 's/\b0(?!9*~)|([0-9])(?=9*~[0-9]*?\1([0-9]))|~[0-9]*/$2/g'

# Output > 1 2 3 4 8 9 10 11 20 100 110 200 910 1000 1100 1910