Regex number of digits, Oct 1, 2012 · In Regex, . * means zero or more times. *). It's just that I'm a bit confused about why the first question mark and colon are there. Could you explain me with some examples their usefulness? I don't understand them enough. Matches: I bought sheep. . * will again consume the entire string. then we must have a dot . thank you In case it is JS it indicates the start and end of the regex, like quotes for strings. 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. refers to any character, be it a number, an aplhabet character, or any other special character. I bought a sheep. 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. However, since the engine will have reached the end of the string and the pattern is not yet satisfied (the . Apr 7, 2011 · I'm reading the regular expressions reference and I'm thinking about ? and ?? characters. ? then we may or may not have a second dot $|/ and finally, we either end the line (that's what the $ sign does), or continue after a 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. Another option that only works for JavaScript (and is Oct 3, 2010 · Now, when the regex engine tries to match against aaaaaaaab, the . How do I make an expression to match absolutely anything (including whitespaces)? Example: Regex: I bought _____ sheep. stackoverflow. com/questions/15661969/… Sep 13, 2015 · Let's deconstruct your regex (I removed the backslashes that are used to escape characters for the sake of simplification, we will use the dots and slashes as literal here) so we're left with : ^. * consumed everything but the pattern still has to match b afterwards), it will backtrack, one character at a time, and try to match b. I bought five sheep. As a result, when a match finally happens, a greedy repetition would match as many reps as possible. This means "match any number of characters that are either whitespace or non-whitespace" - effectively "match any string". Normally the dot matches any character except newlines. If you're using JavaScript, which doesn't have a "dotall" option, try [\s\S]*. ?($|/) ^ means the beginning of a line . * isn't working, set the "dot matches newlines, too" option (or use (?s). Oct 1, 2012 · In Regex, . In regex in general, ^ is negation only at the beginning of a character class. So if . I tried usi Oct 3, 2010 · Now, when the regex engine tries to match against aaaaaaaab, the .
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