digitalmars.D.bugs - [Issue 19979] New: std.regex should return null for non-matched
- d-bugmail puremagic.com (25/25) Jun 17 2019 https://issues.dlang.org/show_bug.cgi?id=19979
https://issues.dlang.org/show_bug.cgi?id=19979 Issue ID: 19979 Summary: std.regex should return null for non-matched captures Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P4 Component: phobos Assignee: nobody puremagic.com Reporter: dlang-bugzilla thecybershadow.net Consider this D program: void main() { auto m = matchFirst("bad", `^(?P<negation>not )?bad$`); assert(m); assert(!m["negation"]); } Currently, the assertion will fail, even though the capture "negation" was not found in the sought string. Ideally, std.regex would return "null" in this circumstance. (Currently, it returns input[0..0], which is a true-ish value.) --
Jun 17 2019