Remove consecutive duplicate characters in a string javascript

Question

I have some string like 11122_11255_12_223_12 and the output I wish to have is this: 12_125_12_23_12
I already looked at this and also this a

Answer 1

You can use capture group and back-reference:

result = str.replace(/(.)\1+/g, '$1')

RegEx Demo

• (.): Match any character and capture in group #1
• \1+: Match 1+ characters same as in capture group #1