Regex match exact number not if it exist in string

Question

My regex:

/3\\b/

Matches:

103

134,256,3

I want it to only match the lone 3. The number 3 will be a dyna

Answer 1

If you want to match only 3 in line you can use anchors like this:

^3$

On the other hand if you want to match 3 in a line with more data you need to add an additional \b at your regex as Barmar showed in her answer

Answer 2

Put a word boundary before it as well:

\b3\b