What is the regular expression for "__" ?

I just read through String and Pattern API, can't figure it out.
I want to go:
String.replaceFirst("__", "_");
i.e., replace the first 'double under-score' with a single underscore.
But it "__" is now a regular expression. Please help ! Thanks.

My mistake was I though it would change the
string...
text.replace(...)
should be
text = text.replace(...)A frequent mistake. I didn't notice, since I was focused on the regex aspect of the question.
� {�                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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