https://issues.dlang.org/show_bug.cgi?id=14504
Issue ID: 14504 Summary: Regex Optimizer doesn't merge equivalent threads. Product: D Version: D2 Hardware: x86 OS: Mac OS X Status: NEW Severity: normal Priority: P1 Component: DMD Assignee: nob...@puremagic.com Reporter: reaperunr...@gmail.com Given the following code: import std.stdio, std.regex; void main(string argv[]) { string m = argv[1]; auto p = ctRegex!("a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"); if (match(m, p)) { writeln("match"); } else { writeln("no match"); } } Compile time becomes extremely long due to the regex optimizer not merging equivalent threads as explained in the forum post here: http://forum.dlang.org/post/gcxnuocczmdosombv...@forum.dlang.org --