Regex and Filter

JavaScript
1

Q. Want to display only string which has same character

  var x=["aa","ab","ac","ba","bb","bc","ca","cb","cc"];
  //desired output- aa,bb,cc
  //i am trying 
console.log(x.filter(y=>(/(?=\w+)(?=\w{2})/).test(y)));

Please help me to get solve

2

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make easier to read.

See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.

Note: Backticks are not single quotes.

markdown_Forums

3

Hint: look at backreferencing captured groups.

4 
Thank You @ArielLeslie.
It solves my problem
console.log(x.filter(y=>(/(\w)\1/).test(y)))
5

I’m glad I could help. Happy coding!