whats wrong with my c++ regex match

Question

i am writing an robots.txt parser in c++

 boost::regex exrp( "^User-agent:\s*(.*)"); boost:: match_results<string::const_iterator> what; if(boost::regex_search( robots, what, exrp ) ) { string s( what[1].first, what[1].second ); cout<< s; }

this should match the useragent with name * but it it returns all datas

rubber boots · Accepted Answer · 2011-02-20 19:49:34Z

4

You need the double backslash '\\' if you don't use c++0x raw strings.

answered Feb 20, 2011 at 19:49

rubber boots

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Martin Stone · Accepted Answer · 2011-02-21 10:06:44Z

If you want it to match only User-agent: * and not also (e.g.) User-agent: webcrawler you need

"^User-agent:\\s*\\*"

The * character has a special meaning, so must be escaped with \. The (.*) in your code matches zero or more occurrences of any character and captures the match.

Edit: You also need to escape the backslashes as pointed out by rubber boots.

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