How to Replace Substrings in C ?

Replace substring with another substring in C

In C , replacing a substring with another substring can be achieved using various functions. Let's explore some of these options:

std::regex_replace (C 11 and later)

This function takes a regular expression as an argument and performs a search and replace operation on the input string. Here's an example:

#include <string>
#include <regex>

std::string test = "abc def abc def";
test = std::regex_replace(test, std::regex("def"), "klm"); // replace 'def' -> 'klm'
// test = "abc klm abc klm"

std::string::replace (C 11 and later)

This member function of the std::string class allows you to replace a substring with a new value. It takes two arguments: the substring to be replaced and the new value.

std::string test = "abc def abc def";
test.replace(test.find("abc"), 3, "hij"); // replace "abc" with "hij"
test.replace(test.find("def"), 3, "klm"); // replace "def" with "klm"
// test = "hij klm hij klm"

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