No pain,No gain

NSString <-> const char *

const char* convert = "hello remove this: *";

NSString *input = [[NSString alloc] initWithUTF8String:convert];// convert 

//remove * FROM THE STRING          
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"*"]; 

// REPLACE * WITH NOTHING                   
input = [[input componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""];

// CONVERT BACK         
const char *converted_back = [input UTF8String]; 

참고 링크 : http://stackoverflow.com/questions/10284011/convert-const-char-to-nsstring-and-convert-back-nsautoreleasenopool