How to Insert Dash Between Numbers and Text Javascript [closed]

Question

Here are the example of input and output

Example input: SSS1111 Output: SSS-1111

Example input: SS111 Output: SS-111

Answer 1

Assuming strings consist of one or more letters (A-Z) followed by one or more numbers (0-9):

var before = 'SSS1111'
var after = s.replace( /([a-z])(\d)/i, '$1-$2' )

The regexp matches matches any letter [a-z] followed by any digit \d and replaces it with the letter, followed by a dash, followed by the digit.