regex_error. What's wrong with my regex

Question

I'm getting regex_error for some reason. I also tried it the regular way of using escape characters (this method eliminates the need for escape sequences in c++ 11 by putting R"(something)" )

By the way if anyone was wondering, they are for recognizing lines in xml

When I use a web based regex tester it works fine.

string sstart = R"(\w*+(> ? +[^\\])++>)";
string send = R"(.*<\\\w\w[^m-o][^_]++)";
string sdata = R"([^>]++>[^ ]++)";

regex endtag(send);
regex taganddata(sdata);
regex starttag(sstart);

You should include what these regex are trying to match. I'm having a hard time discerning between metacharacters and literals. — Tim Biegeleisen, May 22 '16 at 07:21
Regular expressions are not really able to handle nested constructs such as XML. — Some programmer dude, May 22 '16 at 07:23
@TimBiegeleisen That's the thing with the "raw" string literals introduced in C++11, you don't need to escape the backslash. — Some programmer dude, May 22 '16 at 07:40

score 1 · Answer 1 · answered May 22 '16 at 07:23

1

Syntax of you regular expressions is incorrect because of '++' part.

.+ matches one or more occurrences. But what do you try to match with .++ ?

answered May 22 '16 at 07:23

CodeFuller

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The second `+` is called possessive quantifier, see: http://stackoverflow.com/q/5319840/372239 – Toto May 22 '16 at 12:28

regex_error. What's wrong with my regex

1 Answers1