replace regex capture group code example

Example 1: replace with regex capture group

print(readline().replace(/(\d+)(.) ?/g,(a,b,c)=>c.repeat(b)))

Example 2: replace with regex capture group

str.replace(/(.*name="\w+)\d+(\w+".*)/, "$1!NEW_ID!$3")

Example 3: replace with regex capture group

str.replace(/(?<=name="\w+)\d+(?=\w+")/, '!NEW_ID!') // look behind & look ahead