怎么在字符串指定字符后添加特定字符

Question

比如string = "acddeaffrbaffr", 然后我想在a和d的后面添加b,变成"abcdbdbeabffrbabffr"

Answer 1

string.replace(/a|d/g, $0 => $0 + 'b')

Answer 2

"acddeaffrbaffr".replace(/(?<=(a|d))/g, 'b')

Answer 3

"acddeaffrbaffr".replace(/(a|d)/g,'$1b')

Answer 4

使用正则表达式replace()