Question

Using .NET regular expressions.

Let’s say I have the following text:

ddddddddddd

And I would like to test for a repetition of more than 2 for any character.

The regex should not return a match for a text containing double letters like the word “look”.

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UPDATE

Do not assume the input text only consists of repetition of the letter d.
I want ANY repetition of characters.

Answer 1

Try this

(.)\1{2,}

See it here on Regexr

The . matches any character, this character is stored in group 1, because of the brackets around it. The \1{2,} checks then for 2 or more of this character (together with the originally matched character then 3 or more.)