Jean-Francois Bastien wrote:
Here is a simplification of my expression: sregex expression = sregex::compile( /* 1 */ "^(" /* 2 */ "c[^\r\n]*(?:\r?\n|\r)" /* 3 */ "(?:" /* 4 */ "(?!c)" /* 5 */ "[^\r\n]*(?:\r?\n|\r)" /* 6 */ ")*" /* 7 */ ")" );
Basically: match lines starting with a "c" and the line that follow, until another line starting with a "c" is found.
This gives a "quantifier not expected" exception. Changing line 3 to a normal group solves the problem. Changing lines 2 and 5's groups to normal groups also solves the problem.
Yes, it's a bug. This is a hard one to hit, too. It happens when: - The quantifier applies to a group - The group is non-capturing - The first element within the non-capturing group is something that cannot be quantified, such as a zero-width assertion; eg., (?!c) I've already fixed this on HEAD and added a test. The fix to the RC is more involved. I'll look into it. I do NOT believe this problem to be serious enough for 1.34.1, though. It happens quite rarely, and there is a work-around. Thanks for the report. -- Eric Niebler Boost Consulting www.boost-consulting.com