Java Regex Negative Lookahead

Question

After looking through the answers that are already on StackOverflow regarding this issue, I settled with the most accurate one I could find:

Java regex: Negative lookahead

I went over to gskinner and tested it. I put /foo/(?!.*\\\\bbar\\\\b).+ in the pattern input box and the following in the regex match text area:

/foo/abc123doremi

/foo/abc123doremi/bar/def456fasola

Gskinner recognised both of these as matches though so clearly either Gskinner is wrong or the regex pattern above isn't correct. Any thoughts?

Answer 1

You are looking for \\bbar\\b while your text contains /bar/ .

What you meant is probably \\bbar\\b (ie /foo/(?!.*\\bbar\\b).+ )

Note that "duplicate the \\ " is only required inside of Java String literals. That makes writing regexs in Java a bit of a pain.