regex_error in C++ with really simple expression

Question

I have a set of strings like this violet+2, orange-3 and things like that. It is a way to name colours. I want to get the color, operation and number with regex using this piece of code:

int parseColor(string color){
smatch sm;
int ret = -1;
    if (regex_match(color,sm,regex("(.*)([+-])(.*)")))
        ret = s_colors[sm[1].str()]+s_colors[sm[2].str()]*atoi(sm[3].str().c_str());

return ret;
}

where s_colors is a map that matches each colour to a integer value and the +,- sign to +1 and -1.

I have tried also scaping the +- signs with \\+ and \\- but it doesn't work either. Every time I run I get regex_error. Trying this in ruby seems to work so... I am not sure what is the error with the regex.

I am using now gcc 4.8.2 and with every string with the format I posted before it crashes. For example, violet+2 doesn't work (just picking one). — Juanpe Araque, Mar 23 '15 at 17:43
Manuel beat me to it, but your compiler _does not support regexes_. Therefore this is a near-enough duplicate of http://stackoverflow.com/q/12530406/560648. — Lightness Races in Orbit, Mar 23 '15 at 17:52

score 4 · Accepted Answer · answered Mar 23 '15 at 17:50

4

Gcc 4.8.2 does not support regex. You need 4.9

answered Mar 23 '15 at 17:50

Manuel Barbe

2,104
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21

I thouhgt that using the c++11 flag would be enough. Thanks a lot then, I will try something else. – Juanpe Araque Mar 23 '15 at 17:59

regex_error in C++ with really simple expression

1 Answers1