How to insert a string-token before occurrence of another string-token in a string with Javascript

Question

I have a string like this

'I am a beautiful string ABC where sometimes ABC there ABC are weird tokens ABC'

I need to insert another token, let's say '123', before any occurrence of the token 'ABC' in my string. In other words the result I want to obtain is

'I am a beautiful string 123ABC where sometimes 123ABC there 123ABC are weird tokens 123ABC'

I have tried several solutions, but none looks to me elegant. Any suggestion to solve this problem would be appreciated.

score 1 · Accepted Answer · answered Nov 18 '19 at 14:50

1

You can use split and join

console.log(
  'I am a beautiful string ABC where sometimes ABC there ABC are weird tokens ABC'
  .split("ABC")
  .join("123ABC")
)

answered Nov 18 '19 at 14:50

mplungjan

169,008
28
173
236

score 1 · Answer 2 · answered Nov 18 '19 at 14:50

You could replace the string by searching for ABC and add a prefix '123' to the found substring.

var string = 'I am a beautiful string ABC where sometimes ABC there ABC are weird tokens ABC',
    result = string.replace(/ABC/g, '123$&');

console.log(result);

How to insert a string-token before occurrence of another string-token in a string with Javascript

2 Answers2