using regex under c++11 [duplicate]

Question

Possible Duplicate:
C++0x regex in GCC

I was trying to transform a file under c++ using regex, some regex_error keeps on occuring, here is the code:

std::ifstream inf(in);
std::ofstream outf(out);
try{
std::regex line_regex("[[:alnum:]]");
std::string line;
while(std::getline(inf,line))
{
    if(std::regex_match(line,line_regex))
        outf<<line<<std::endl;
}

the error message is:

terminate called after throwing an instance of 'std::regex_error'
what():  regex_error

by the way, I'm using gcc 4.7.2 on linux x64.

gcc version 4.6.1 had only partial support for std::regex, I don't know if it has been fixed in version 4.7.0 yet, on second thought I think they haven't fixed it check for regex in here gcc.gnu.org/onlinedocs/libstdc++/manual/… — chipmunk
– chipmunk, Commented Dec 16, 2012 at 7:13
I tried std::regex on 4.6.2 and couldn't get it to work either. Ended up wrapping PCRE instead. I think the Perl regex syntax is the best and most expressive and PCRE is an extremely stable time-honored library. — Andrew Tomazos
– Andrew Tomazos, Commented Dec 16, 2012 at 8:42

Pete Becker · Accepted Answer · 2012-12-16 12:17:46Z

5

GCC's implementation of <regex> is unusable. Don't waste your time on it.

answered Dec 16, 2012 at 12:17

Pete Becker

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2 Comments

flyingfoxlee Over a year ago

Yes,I use the boost version instead, it works fine.

Pete Becker Over a year ago

@flyingfoxlee - as does the Microsoft version.

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