For a string to be inside another string means that the first string is a part of the second string. This is also known as substring or subsequence.
You can use the indexOf() method in most programming languages to check if a string is inside another string. If the method returns a value of -1, then the string is not present. If it returns a value greater than -1, then the string is present.
Yes, it is possible to have multiple instances of the same string inside another string. The indexOf() method will only return the first index of the string, so you may need to use a loop to check for all instances.
You can use the substring() method to extract a specific portion of a string inside another string. This method takes in two parameters, the starting index and the ending index, and returns the extracted string.
Yes, you can use the replace() method to replace a string inside another string. This method takes in two parameters, the string to be replaced and the string to replace it with, and returns the modified string.