Question

This regex below captures the -aaaa and -cccc but not the -eee
How can I do that?

keywords = "-aaa bbb -ccc -eee";
MatchCollection wordColNegEnd = Regex.Matches(keywords, @"-(.*?) ");

Answer 1

Use a “word boundary” /\b/ instead of a space, which matches the end of the string as well as a word/non-word boundary:

Regex.Matches(keywords, @"-(.*?)\b");

or, depending on what characters may be in the strings, just use “word characters” /\w/ to match the pattern:

Regex.Matches(keywords, @"-(\w+)");