Replace a sub-string in a string.

Question

Accepted Answer

To replace a sub-string in a string, use the replace() method.

Use the replace() method with the old sub-string and new sub-string as arguments.
The replace() method only replaces the first occurrence of the sub-string by default.
To replace all occurrences, use a regular expression with the global flag.
Example: 'hello world'.replace('world', 'universe') returns 'hello universe'.
Example: 'hello world'.replace(/world/g, 'universe') returns 'hello universe'.

Accepted Answer

#include 
 #include 
  int main() {
  char str[256], substr[128], replace[128], output[256];
  int i = 0, j = 0, flag = 0, start = 0;
  //Accepts all the inputs
  printf("Enter your input string:
");
  gets(str);
  printf("Enter the string to be removed:
");
  gets(substr);
 
  printf("Enter the string to replace:
");
  gets(replace);
  str[strlen(str) - 1] = '\0';
  substr[strlen(substr) - 1] = '\0';
  replace[strlen(replace) - 1] = '\0';
 
  // check whether the substring
  to be replaced is present 
  while (str[i] != '\0')
  {
  if (str[i] == substr[j]) 
  {
  if (!flag)
  start = i;
  j++;
  if (substr[j] == '\0')
  break;
  flag = 1;
  } 
  else 
  {
  flag = start = j = 0;
  }
  i++;
  }
 
  if (substr[j] == '\0' && flag)
  {
  for (i = 0; i < start; i++)
  output[i] = str[i];
  // replace substring with another string 
  for (j = 0; j < strlen(replace); j++) 
  {
  output[i] = replace[j];
  i++;
  }
 
  // copy remaining portion of the input string "str" 
  for (j = start + strlen(substr); j < strlen(str); j++)
  {
  output[i] = str[j];
  i++;
  }
 
  // print the final string 
  output[i] = '\0';
  printf("Output: %s
", output);
  } else {
  printf("%s is not a substring of %s
", substr, str);
  }
  return 0;
 }

Replace a sub-string in a string.

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