CODEWITHSUNDEEP
c++stringstd
mathematician1975
mathematician1975

Reputation: 21351

Replacing instances of a given std::string with another std::string in C++

I have been looking online without success for something that does the following. I have some ugly string returned as part of a Betfair SOAP response that uses a number of different char delimiters to identify certain parts of the information. What makes it awkward is that they are not always just one character length. Specifically, I need to split a string at ':' characters, but only after I have first replaced all instances of "\\:" with my personal flag "-COLON-" (which must then be replaced again AFTER the first split).

Basically I need all portions of a string like this

 "6(2.5%,11\:08)~true~5.0~1162835723938~"

to become

 "6(2.5%,11-COLON-08)~true~5.0~1162835723938~

In perl it is (from memory)

 $mystring =~ s/\\:/-COLON-/g;

I have been looking for some time at the functions of std::string, specifically std::find and std::replace and I know that I can code up how to do what I need using these basic functions, but I was wondering if there was a function in the standard library (or elsewhere) that already does this??

Upvotes: 3

Views: 235

Answers (2)

AJG85
AJG85

Reputation: 16197

If you have C++11 something like this ought to do the trick:

#include <string>
#include <regex>

int main()
{
std::string str("6(2.5%,11\\:08)~true~5.0~1162835723938~");
std::regex rx("\\:"); 
std::string fmt("-COLON-");
std::regex_replace(str, rx, fmt);

return 0;
}

Edit: There is an optional fourth parameter for the type of match as well which can be anything found in std::regex_constants namespace I do believe. For example replacing only the first occurrence of the regular expression match with the supplied format.

Upvotes: 1

Benjamin Lindley
Benjamin Lindley

Reputation: 103693

boost::replace_all(input_string, "\\:", "-COLON-");

Upvotes: 5

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