find a string within substring jQuery

string contains substring jquery

First Option
This indexOf() method will return the position of the match, or -1 if it isn’t found.

// returns -1 if doesn't contains
// Note that this is case-sensitive
if (str.indexOf("Hello") >= 0) 
{
 //string contains Hello
}
// OR
// If you want a case-insensitive search, you can write 
// returns -1 if doesn't contains
if (str.toLowerCase().indexOf("hello") >= 0)
{
  //string contains hello
}

Second Option

//returns false if doesn't contains
if (/hello/i.test(str))
{
 //string contain Hello
}