Regex replace comma with newline. This should work in most regex dialects. I tried usi Apr 7, 2011 · I'm reading the regular expressions reference and I'm thinking about ? and ?? characters. stackoverflow. com/questions/15661969/… Jun 1, 2017 · Specifically when does ^ mean "match start" and when does it mean "not the following" in regular expressions? From the Wikipedia article and other references, I've concluded it means the former a Dec 8, 2018 · The regex compiles fine, and there are already JUnit tests that show how it works. In case it is JS it indicates the start and end of the regex, like quotes for strings. In regex in general, ^ is negation only at the beginning of a character class. . If you want the semicolon included in the match, add a semicolon at the end of the pattern. Could you explain me with some examples their usefulness? I don't understand them enough. How do I make an expression to match absolutely anything (including whitespaces)? Example: Regex: I bought _____ sheep. As a result, when a match finally happens, a greedy repetition would match as many reps as possible. Repetition in regex by default is greedy: they try to match as many reps as possible, and when this doesn't work and they have to backtrack, they try to match one fewer rep at a time, until a match of the whole pattern is found. Oct 1, 2012 · In Regex, . It's just that I'm a bit confused about why the first question mark and colon are there. *\\d). Oct 1, 2012 · In Regex, . thank you Oct 15, 2009 · May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?=. Unless CMake is doing something really funky (to the point where calling their pattern matching language "regex" could be regarded as misleading or incorrect) I'm guessing the fact that it worked for you was an isolated accident. Also, the pattern will match the whole line if there is no semicolon. I bought a sheep. * means zero or more times. I bought five sheep. refers to any character, be it a number, an aplhabet character, or any other special character. Matches: I bought sheep. Notes: The pattern will match everything up to the first semicolon, but excluding the semicolon.