Invalid escape sequence

Question

I would like to filter out all words containing 1 number and 3 capital letters with a total length of 4. See my example here: http://gskinner.com/RegExr/?32taa

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Answer 1

In Java, you need to escape the backslash with an extra backslash, when representing the pattern in string.

So, \b should be \\b, and \d should be \\d.