09 Digit Commas
Digit commas formatting
Insert commas in the numbers for greater readability before each group of three digits.
Input text:
Ten Countries with the Highest Population:
1 China 1361220000
2 India 1236800000
3 United States 317121000
4 Indonesia 237641326
5 Brazil 201032714
6 Pakistan 184872000
7 Nigeria 173615000
8 Bangladesh 152518015
9 Russia 143600000
10 Japan 127290000
Desired output:
Ten Countries with the Highest Population:
1 China 1,361,220,000
2 India 1,236,800,000
3 United States 317,121,000
4 Indonesia 237,641,326
5 Brazil 201,032,714
6 Pakistan 184,872,000
7 Nigeria 173,615,000
8 Bangladesh 152,518,015
9 Russia 143,600,000
10 Japan 127,290,000
Honestly, this isn’t even that interesting for a parser. The important
thing is that you be able to execute code before making the
replacement. (This is Perl’s /e modifier to the regex. Examples in Perl.)