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

Question

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??

Have you looked at the C++11 RegEx facilities? cplusplus.com/reference/std/regex It includes match-replace operations cplusplus.com/reference/std/regex/match_replace — Nicu Stiurca
– Nicu Stiurca, Commented Jul 10, 2012 at 19:33
Im not too up on C++11 as the compiler I am currently writing this on does not support C++11. Thanks for the suggestion anyway. — mathematician1975
– mathematician1975, Commented Jul 10, 2012 at 19:38
possible duplicate of C++ Replace part of a string with another string — Troubadour
– Troubadour, Commented Jul 10, 2012 at 19:59

Benjamin Lindley · Accepted Answer · 2012-07-10 19:33:06Z

5

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

answered Jul 10, 2012 at 19:33

Benjamin Lindley

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1 Comment

Qaz Over a year ago

Sometimes I wish the standard had stuff like this.

AJG85 · Accepted Answer · 2012-07-10 19:44:52Z

1

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.

edited Jul 10, 2012 at 19:44

answered Jul 10, 2012 at 19:39

AJG85

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