detect new line using C++ boost regex_match

Asked Jun 14 '16 at 16:46

Active Jun 14 '16 at 16:46

Viewed 241 times

I am trying to remove the first line in a string using regex.

As we know, the line return is OS dependent so I am using \r\n|\n|\r as regex.

The only issue is, i cannot get it to work..

int findMatchOffset(const std::string & iStr, const boost::regex & iExpression)
{
    boost::smatch aResults;
    if(boost::regex_match(iStr, aResults, iExpression))
    {
        return aResults.position();
    }
    return -1;
}

void removeFirstLine(std::string & ioMessageStr)
{
    boost::regex kNewLine("\r\n|\n|\r", boost::regex_constants::bk_vbar);
    int aIndex = findMatchOffset(ioMessageStr, kNewLine);

    ioMessageStr.erase(0, aIndex + 1);
}

Can you spot the error in the code above?

regex_match returns false, why?

Thanks for your help.

asked Jun 14 '16 at 16:46

Orkun

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You want `boost::regex_search`. `regex_match` is for the whole string, which presumably is not only `\r\n` or `\n` or `\r`. – LogicStuff Jun 14 '16 at 16:52
Also, it seems you may use `\R` to match any line break style in Boost – Wiktor Stribiżew Jun 14 '16 at 18:34
@WiktorStribiżew somebody do sth with this title then : 'Boost regex not working as expected in my code ' ... -_- – Orkun Jun 15 '16 at 07:19
Good, what do you suggest? What searchwords did you use? – Wiktor Stribiżew Jun 15 '16 at 07:24
@WiktorStribiżew OS independent, new line, detect, regex, boost, c++ .. pretty much like in the title. – Orkun Jun 15 '16 at 12:06
Found almost at once: http://stackoverflow.com/a/20058432/3832970 – Wiktor Stribiżew Jun 15 '16 at 12:08
@WiktorStribiżew congrats – Orkun Jun 15 '16 at 12:11

detect new line using C++ boost regex_match

0 Answers0