How to find the occurrences of the following characters in a string with a regular expression?

How can I find occurences of same subsequent characters in a string with a regular expression or function?

Example:

I am leet and I have a three pizzas. That noob right there has only one pizza. Poor boy.

/(.)\1/

Change \1 to \1+ if you want to find sequences of length two or more.

Note that the syntax can vary depending on the regular expression engine you are using.

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