How does \b work when using regular expressions?

Question

If I have a sentence and I wish to display a word or all words after a particular word has been matched ahead of it, for example I would like to display the word fox

Answer 1

The \b token is kind of special. It doesn't actually match a character. What it does is it matches any position that lies at the boundary of a word (where "word" in this case is anything that matches \w). So the pattern (?<=brown\s)(\w+) would match "bbbbrown fox", but (?<=\bbrown\s)(\w+) wouldn't, since the position between "bb" and "brown" is in the middle of a word, not at its boundary.