Regular expressions: how to match a particular word by itself and not when it is in a sentence?

I have a program where the user will type words into an input box and the computer will check the input for key words. I have a slight problem, see below:

• User input #1: "Perfect"
• User input #2: "Perfect how are you?"

I created the regex /(\bperfect\b)/ig.

How can I modify my regular expression so that it will only match the word "perfect" by itself and not perfect in user input #2?

>Solution :

This regex should work:

/^Perfect$/g

The anchor ^ matches the start of the string and the anchor $ matches the end of the string. More on this here!