How to remove double white space character using regexp?

Question

Input:

".    .   .  . ."

Expected output:

". . . . ."

Answer 1

text = text.replace(/\s{2,}/g, ' ');

• \s will take all spaces, including new lines, so you may change that to / {2,}/g.
• {2,} takes two or more. Unlike \s+, this will not replace a single space with a single space. (a bit of an optimization, but it usually makes a differance)
• Finally, the g flag is needed in JavaScript, or it will only change the first block of spaces, and not all of them.

Answer 2

try

result = str.replace(/^\s+|\s+$/g,'').replace(/\s+/g,' ');