Extract a substring in C

Question

i am trying to extract the username from this uri field in ANSI C code on linux using gcc

mail:[email protected]

so i need to strip the mail: and everything after the @. Are there any built in functions in C to extract substrings

Answer 1

char *uri_field = "mail:[email protected]";

char username[64];

sscanf(uri_field, "mail:%63[^@]", username);

If you might have other "junk" at the beginning (not necessarily just mail:), you could do something like this instead:

sscanf(uri_field, "%*[^:]:%63[^@]", username);