CODEWITHSUNDEEP
javascriptregexnode.js
Jakob Nielsen
Jakob Nielsen

Reputation: 5198

Conditional regex replace in nodejs

I have an address like this:

117042,ABC DEF,HIJ KLMNOP,9,170

and want to have

117042,ABC DEF,HIJ KLMNOP 9 170

I tried it with this replace Regex

address = address.replace(/,[\d]/g, " ");

but this results in

117042,ABC DEF,HIJ KLMNOP  70

I do not want to replace the digit but still need to check if the digit comes after the comma to not match the other commas.

I am not very good with regex thats why I am asking for help.

Upvotes: 2

Views: 172

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627087

You may only replace commas after numbers if they occur at the end of string:

var s = "117042,ABC DEF,HIJ KLMNOP,9,170";
var res = s.replace(/,(\d+)(?=(?:,\d+)*$)/g, " $1");
console.log(res);

The ,(\d+)(?=(?:,\d+)*$) regex matches:

  • , - a comma
  • (\d+) - (Group 1, referred to via $1 from the replacement pattern) one or more digits
  • (?=(?:,\d+)*$) - a positive lookahead that requires 0+ sequences of , + one or more digits at the end of the string.

Upvotes: 3

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