I have a std::string A I need to find in it string B with content like bla-bla-bla and replace it with other string C like abcdefg and if B was not found just put C at the beginning of A.
How to do such thing?
- it is use full when you have some ones url and you want to make it use something like 'rtmp://' instead of 'http://' and ofcourse you newer know if 'http://'.)Rella– Rella2010-11-17 22:16:02 +00:00Commented Nov 17, 2010 at 22:16
- 3Have you looked at string::replace and string::find?Cascabel– Cascabel2010-11-17 22:16:34 +00:00Commented Nov 17, 2010 at 22:16
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2 Answers
void replace_or_merge(std::string &a, const std::string &b, const std::string &c) { const std::string::size_type pos_b_in_a = a.find(b); if(pos_b_in_a == std::string::npos) { a.insert(0, c); } else { a.replace(pos_b_in_a, b.length(), c); } } 
1 Comment
Tony Delroy
+1 / sounds logic, but better to pass b and c as
const std::string&A.replace(str.find(B), B.length(), C); You might want to add error checking ;-)
