regex - javascript replace all occurrences ",\S" with ", \S" -

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i want have spaces separating items in csv string. "123,456,789" => "123, 456, 789". have tried, been unable construct regexp this. read postings , thought trick, no dice. 

 text = text.replace(new regexp(",\s", "g"), ", ");

could show me doing wrong?

you have 2 problems:

  1. backslashes pain in the, um, backslash; because have many meanings (e.g. let put quote-mark inside string), end needing escape backslash backslash, need ",\\s" instead of ",\s".
  2. the \s matches a character other whitespace, character gets removed , replaced along comma. easiest way deal "capture" (by putting in parentheses), , put in again in replacement (with $1).

so end this:

text = text.replace(new regexp(',(\\s)', "g"), ", $1");

however, there neater way of writing this, because javascript lets write regex without having string, putting between slashes. conveniently, doesn't need backslash escaped, shorter version works well:

text = text.replace(/,(\s)/g, ", $1");

as alternative capturing, can use "zero-width lookahead", in situation means "this bit has in string, don't count part of match i'm replacing". that, use (?=something); in case, it's \s want "look ahead to", (?=\s), giving version:

text = text.replace(/,(?=\s)/g, ", ");

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