Question

I use this regex to put thousand separators in a string:

while matchstr(mystr, '\(\d\)\(\d\{3}\)\(\D\|\s\|$\)') != ''
    let mystr = substitute(mystr, '\(\d\)\(\d\{3}\)\(\D\|\s\|$\)', '\1.\2\3', 'g')
endwhile

For

let mystr = '2000000'

the code above gives

2.000.000

The problem is when there is a decimal separator, it also puts thousand separators in the fractional part of a number after the decimal separator (which is the comma hereafter).

For example,

let mystr = '2000000,2346'

leads to

2.000.000,2.346

while I want it to be

2.000.000,2346

I tried to adapt the above code but didn’t find a satisfiable solution.
Can anyone help me?

Answer 1

Use the following call to the substitute() function instead of the whole
loop listed in the question.

substitute(s, '\(\d,\d*\)\@<!\d\ze\(\d\{3}\)\+\d\@!', '&.', 'g')