Question

I have a pattern in the string like this:

T T and I want to T

And It can be any character from [a-z].

I have tried this Regex Example but not able to replace it.

EDIT

Like I have A Aa ar r then it should become Aar means replace any character 1st or 2nd no matter what it is.

Answer 1

You can use the backreferences for this.

/([a-z])\s*\1\s?/gi

Example

Some more explanation:

(           begin matching group 1
    [a-z]   match any character from a to z
)           end matching group 1
\s*         match any amount of space characters
\1          match the result of matching group 1
            exactly as it was again
            this allows for the repition
\s?         match none or one space character
            this will allow to remove multiple
            spaces when replacing