This is a very naive implementation of the PHP function str_replace in C. I wrote it in purpuse to learn C basics.

Basically, it search for the index of the searched word in the subject string.

If no index found, then it returns the subject.

Otherwize it splits the subject string into 3 parts :

• prefix : all chars before the searched word
• searched word
• suffix : all chars after the searched word and it replaces the searched word by the replace parameter.

Finally, it join prefix with replace and suffix, and returns it as string.

char *original_str, *replaced_str;
   
original_str = "This is a very powerful implementation of str_replace function";
replaced_str = str_replace("powerful", "naive", original_str); 
// --> RESULT : "This is a very naive implementation of str_replace function"

free(replaced_str);