正则表达式到MySQL

Question

Need to construct regexp to this

2 1231 21231 2312 2123 22 2

Need to find only 2, not 1231, not 21231, only 2

So, my regexp is

^[[:digit:]]?{1}[2]{1}^[[:digit:]]?

Is it right ?

Sorry if my ask like a 'do it for me', but i really cannot into regexp.

UPD
input string 2 22 1312 123123 22312 21 2
need to match "2"
2 22 1312 123123 22312 21 2
with or w\\o digits after\\before

Answer 1

Sounds simple enough...

/\b2\b/g

How about this one? Example