How to find a string within a jQuery or javascript string

Sometimes, you required to find a the existence of a small string with in a string. This article will demonstarte, how could you do by using plain JavaScript. 

First Method 

1. //returns -1 if doesn't contains 

2. if (str.indexOf("Hello") >= 0)  

3. { 

4.  //string contains Hello 

5. } 

6. //OR 

7. //For your are not sure about the case of the string 

8. //returns -1 if doesn't contains 

9. if (str.toLowerCase().indexOf("hello") >= 0) 

10. { 

11.  //string contains hello 

12. } 

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

Second Method 

1. //returns false if doesn't contains 

2. if (/hello/i.test(str)) 

3. { 

4.  //string contain Hello 

5. }